Standard deviation Essays & Research Papers

Standard Deviation objective • Describe standard deviation and it’s importance in biostatistics. Measure of Dispersion • Indicates how widely the scores are dispersed around the central point (or mean.) -Standard deviation Standard Deviation. • The most commonly used method of dispersion in oral hygiene. • The larger the standard deviation, the wider the distribution curve. Standard Deviation • SD,  ,  (sigma) • Indicates how subjects differ from the average of the group/ the more they...

A survey is conducted in Chicago (population 2,800,000) using random-digit-dialing equipment which place calls at random to residential phones, both mobile and landline. The purpose of the survey is to determine the percentage of adults who would favor a half-cent increase in the sales tax to help fund public transportation. Four hundred adults are interviewed and 36% of them favor the proposal. Answer the next two questions. 1. The sample size for this sample survey appears to be a)...

Problem Sheet - I 1. Researcher conducted by a tobacco company indicates that the relative frequency distribution of tar content of its newly developed low-tar cigarette has a mean equal to 3.9 milligrams of tar per cigarette and a standard deviation equal to 1.0 milligram. Suppose a sample of 100 low-tar cigarettes is randomly selected from a day’s production and the tar content is measured in each. Assuming that the tobacco company’s claim is true, what is the probability that the mean...

Assignment 1(STA2204) 1. The Academy of Orthopedic Surgeons states that 80% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this proportion is within 3 percentage points of the true proportion. How large a sample is necessary? (4 marks) 2. The mean number of cups of coffee sold per minute at Relax cafeteria is 3. Assuming that the number of cups of coffee sold is independent of the day, find the probability that (i)...

1. a) Follow the instructions in the applet to fill out the 1st graphs then answer the following question: What is the impact of the new point on the standard deviation? The new point has made the standard deviation to go up to over 2.07 b) Follow the instructions to create the next two graphs then answer the following question: What did you do differently to create the data set with the larger standard deviation. What I did differently was to have two outliners on both ends of the...

TUI Frequency Distributions Module 3/Case 10/148/2012 Professor Kuleshov Frequency Distributions This assignment is based on Frequency Distributions and will include the following information: 1. The ability to describe the information provided by the Standard Deviation. 2. The ability to use the Standard Deviation to calculate the percentage of occurrence of a variable either above or below a particular value. 3. The ability to describe a normal...

Mean and Standard Deviation The mean, indicated by μ (a lower case Greek mu), is the statistician's jargon for the average value of a signal. It is found just as you would expect: add all of the samples together, and divide by N. It looks like this in mathematical form: In words, sum the values in the signal, xi, by letting the index, i, run from 0 to N-1. Then finish the calculation by dividing the sum by N. This is identical to the equation: μ =(x0 + x1 + x2 + ... + xN-1)/N. If you are...

The population standard deviation σ of a discrete random variable , Measure how close a random variable tends to be the population mean μ, so you must understand μ before you understand σ If you have a random variable like a bet at a casino or and investment then the standard deviation σ measure the risk, if there is a lot of risk then the standard deviation is high The formulas for standard deviation are given below but you should look at the examples first Population mean Population...

Final Project 2. a.) Assuming no change in the distribution the probability that the blackness of the spot is less than 1.0 is 48.01%. (1.0-1.005/.10= z-score of -.05 = .4801 or 48.01%) b.) The probability that the blackness of the spot is between .95 and 1.0 is 18.89% (.95-1.005/.10=z score of -0.55 = 29.12%. take answer from #1 and subtract from this answer 48.01-29.12= 18.89%) c.) The probability that the blackness of the spot is between 1.0 and 1.05 is 19.35%. (1.05-1.005/.10=...

(a) Suppose we take a random sample of size 100 from a discrete distribution in this manner: A green die and a red die are thrown simultaneously 100 times and let Xi denote the sum of the spots on the two dice on the ith throw, i = 1, 2,...100. Find the probability that the sample mean number of spots on the two dice is less than 7.5. n = 100 µ = 7 µ[pic] = 7 σ = 2.41 σ[pic] = 2.41 /[pic] |X |2 |3...

Remington’s Steakhouse Project Brian Jones Research Methods & Applications Dr. Jones August 25, 2011 Table of Contents Table of Contents 2 List of Tables 3 Introduction 4 The Research Objectives 4 The Research Questions 5 Literature Review 6 Answers to Research Questions 8 Recommendations to Remington’s 15 References 18 Annotated Bibliography 19 Appendix(ces) 22 List of Tables Table 1 Demographic Description of the Average Remington’s Patron9 Table 2 Reported Income by...

CHAPTER THREE DESCRIPTIVE STATISTICS: NUMERICAL MEASURES MULTIPLE CHOICE QUESTIONS In the following multiple choice questions, circle the correct answer. 1. Which of the following provides a measure of central location for the data? a. standard deviation b. mean c. variance d. range Answer: b 2. A numerical value used as a summary measure for a sample, such as sample mean, is known as a a. population parameter b. sample parameter...

13. Variance and Standard Deviation (expected). Using the data from problem 13, calculate the variance and standard deviation of the three investments, stock, corporate bond, and government bond. If the estimates for both the probabilities of the economy and the returns in each state of the economy are correct, which investment would you choose considering both risk and return? Why? ANSWER Variance of Stock = 0.10 x (0.25 – 0.033)2 + 0.15 x (0.12 – 0.033)2 + 0.50 x (0.04 – 0.033)2 +...

Question 1. (Descriptive Statistics) Investment Returns: These data are the annual returns on shareholders’ funds of 97 of Australian’s top 100 companies for the years 1990 and 1998. (i) Produce a histogram of the 1990 returns. (ii) Produce a histogram of the 1998 returns. (iii) Find the mean, median, range and standard deviation for the 1990 returns. Annual Returns % (1990) Mean 12.91865979 Median 11.38 Standard Deviation 9.297513067 Range 75.01 (iv) Repeat part (iii)...

MATH 107 NAME:_______________________ EXAM 2 Show all work for credit and keep answers exact when possible. 1. Classify the following statement as an example of classical, empirical, or subjective probability and explain your reasoning. According to your doctor he feels the chance of you surviving a surgery is 0.85. Subjective; based upon his feelings. 2. Determine the two events described in the study. Do the results indicate that the events are independent or dependant?...

A business graduate very much wants to get a job in any one of the top 10 accounting firms. Applying to any of these companies requires a lot of effort and paperwork and is therefore costly. She estimates the cost of applying to each of the 10 companies and the probability of getting a job offer there. These data are tabulated below. The tabulation is in the decreasing order of cost. 1. If the graduate applies to all 10 companies, what is the probability that she will get at least one...

The bell curve is literally, the symmetrical curve created on a graph when using a frequency distribution method for a set of data, splitting the mean symmetrically. There is a big difference between standard deviation and the bell curve! Standard deviation shows the difference in variation from the average; the bell curve, also normal distribution or Gaussian distribution, shows the standard deviation and is created by the normal or equal distribution of the mean among either half. The bell...

Statistics-1 1. One thousand candidates sit an examination. The distribution of marks is shown in the following grouped frequency table. Marks|1–10|11–20|21–30|31–40|41–50|51–60|61–70|71–80|81–90|91–100| Number of candidates|15|50|100|170|260|220|90|45|30|20| (a) Copy and complete the following table, which presents the above data as a cumulative frequency distribution. (3) Mark|£10|£20|£30|£40|£50|£60|£70|£80|£90|£100| Number of candidates|15|65|||||905|||| (b) Draw a cumulative...

STANDARD DEVIATION The standard deviation is a popular measure of variability. It is used both as a separate entity and as a part of other analyses, such as computing confidence intervals and in hypothesis testing. The standard deviation is the square root of the variance. The population standard devia¬tion is denoted by σ. Like the variance, the standard deviation utilizes the sum of the squared deviations about the mean (SSx). It is computed by averaging these squared deviations (SSX/N) and...

Standard Deviation in the Business World QRB/501 Abstract On Standard Deviations in Job Performance The purpose of this study was to compare the expected payoffs from personnel programs based on standard deviation of job performances in dollars, the Global Estimation model, and the CREPID procedure. The study was done for route salesmen of a large soft drink bottling company. The Global Estimation model and the CREPID procedure were behaviorally based, where the standard deviation of job...

 Student Exploration: Sight vs. Sound Reactions Vocabulary: histogram, mean, normal distribution, range, standard deviation, stimulus Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Most professional baseball pitchers can throw a fastball over 145 km/h (90 mph). This gives the batter less than half a second to read the pitch, decide whether to swing, and then try to hit the ball. No wonder hitting a baseball is considered one of the hardest things to do in sports! 1....

. 2. Explain why a product or system might have an overall reliability that is low even though it is comprised of components that have fairly high reliabilities. 4. A product engineer has developed the following equation for the cost of a system component: C _ (10 P ) 2 , where C is the cost in dollars and P is the probability that the component will operate as expected. The system is composed of two identical components, both of which must operate for the system to operate. The...

REVIEW EXERCISES CHAPTER 8 AND 9 PROFESSOR JONAS WIU-RES BY DEBRA JAMES CHAPTER 8 1. High temperature in the United States a meteorologist claims that the average of the highest temperatures in the united states in 98. A random sample of 50 cities is selected, and the highest temperatures are recorded. The data are shown. At a=0.05 can the claim be rejected? a=7.7 97, 101, 99, 99, 100, 94, 87, 99, 108, 93, 96, 88, 98, 97,88, 105, 97, 96, 98, 102, 99, 94, 96, 114, 99, 96, 98, 97, 91,...

1.0 Introduction This report will cover the distribution of final exam results for BSB123 and what factors influence the results. Factors that will be considered are the gender of the student, whether the student is studying a double or single degree, the results from the weekly quiz’s and the grade achieved on the mid semester report. The presence of outliers will be determined to help analyse the accuracy of the data. There are an infinite number of internal and external factors that...

Chapter 12 Problems 1. Cash flow (LO2) Assume a corporation has earnings before depreciation and taxes of $100,000, depreciation of $50,000, and that it has a 30 percent tax bracket. Compute its cash flow using the format below. Earnings before depreciation and taxes _____ Depreciation _____ Earnings before taxes _____ Taxes @ 30% _____ Earnings after taxes _____ Depreciation...

Sport Obermeyer Sport Obermeyer started to make firm commitments for producing its 1993-1994 line of fashion skiwear with scant information about how the market would react to the line. Inaccurate forecasts of retailer demand had become a growing problem at Obermeyer: in recent years greater product variety and more intense competition had made accurate predictions increasingly difficult. Also, another issue Sport Obermeyer faced was how to allocate production between factories in Hong...

Standard Deviation Abstract QRB/501 Standard Deviation Abstract Standard Deviations Are Not Perverse Purpose: The purpose of this article is to illustrate how using statistical data, such as standard deviation, can help a cattleman choose the best lot of calf’s at auction. The statistical data used in these decision making processes can also help the cattleman with future analysis of the lots purchased and existing stock. Research Question: How can understanding the...

Century National Bank The following case will appear in subsequent review sections. Assume that you work in the Planning Department of the Century National Bank and report to Ms. Lamberg. You will need to do some data analysis and prepare a short written report. Remember, Mr. Selig is the president of the bank, so you will want to ensure that your report is complete and accurate. A copy of data appears in Appendix N. (EXCEL) Century National Bank has offices in several cities in the...

 Question 1 of 1: Interpreting the Confidence Interval Solve the following problems: A simple random sample of 40 salaries of NCAA football coaches has a mean of $415,953 and a standard deviation of $463,364. Construct a 95% confidence interval estimate of the mean salary of an NCAA football coach. In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects were treated with acupuncture and 80 subjects were given a sham treatment. The numbers of migraine...

Case 2: Gulf Real Estate Properties. Please provide a Managerial Report that includes: 1. Appropriate descriptive statistics to summarize each of the three variables for the forty Gulf View condominiums 2. Appropriate descriptive statistics to summarize each of the three variables for the eighteen No-Gulf View condominiums 3. Comparison of your summary results from #1 & #2. Discuss any specific statistical results that would help a real estate agent understand the condominium market. 4. A...

Independent Project Description This is a test to see how accurate and creative you can be with a common dataset. Use the data set supplied (hypertension, diabetes, cholesterol in subjects, including medication, weight, age, etc) in Docsharing and using Excel, provide the following for the variable(s) of your choice: 1. Frequency distribution of a variable and bar graph of the same variable 2. Descriptive statistics of a continuous dataset: mean, median, mode, skewness, kurtosis,...

Study Guide - Testing the Difference Between Two Means, Two Variances, and Two Proportions 1.|If the test value in the figure below is 2.57 when the critical value is 1.96, what decision about the hypothesis should be made?| A)|reject the null hypothesis | B)|accept the null hypothesis | C)|reject the alternative hypothesis | D)|not enough information | 2.|The standard error of difference is .| A)|True| B)|False| 3.|In the figure below, if the -test value is 1.43, the null...

 Standard Deviation use in the Business World Abstract This paper evaluates the role of standard deviation in business. As part of the evaluation, a brief summary of five different peer reviewed papers has been presented. Topics such as, the purpose of the study, the research questions, the hypothesis of the study, and the main findings of the study for the five papers, have been summarized by each of the learning team members. Standard Deviation use in the Business World Standard...

Part 1 of 1 - | Question 1 of 10 | 1.0 Points | Consider the following scenario in answering questions 1 through 4. Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance. State the null and...

Chapter 9 Quiz 1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 | | | | | | | | | | | | | | | | | | 1 Compute the critical value za/2 that corresponds to a 94% level of confidence. A. 1.88 B. 1.66 C. 1.96 D. 2.33 2. In a sample of 10 randomly selected women, it was found that their mean height was 63.4 inches. Form previous studies, it is assumed that the standard deviation, σ, is 2.4. Construct the 95% confidence interval for the population mean. A. (61.9,...

Name: Ashley Lee Class: HLT-362 Applied Statistics for Healthcare Professionals Date: 04/01/2015 EXERCISE 18 • Mean, Standard Deviation, and 95% and 99% of the Normal Curve 1. Assuming that the distribution is normal for weight relative to the ideal and 99% of the male participants scored between (–53.68, 64.64), where did 95% of the values for weight relative to the ideal lie? Round your answer to two decimal places. In order to find where 95% of the values for the weight of relative to...

Biology Homework #1 1 An error bar drawn on a graph or chart must always be a representation of: 
 -Variation shown by the data 2 The width of 10 leaves was measured and the values in mm were 12, 13, 13, 14, 14, 14, 14, 15, 15, 16. The mean is 14.0mm.What is the best estimate of the standard deviation? 
 -1mm 5 1000 bananas were collected from a single plantation and weighed.Their masses formed a normal distribution. How many bananas would be expected to be within 2 standard deviations of...

II. STATEMENT OF THE PROBLEM As part of a long-term study of individuals 65 years of age or older, sociologists and physicians at the Wentworth Medical Center in upstate New York investigated the relationship between geographic location, health status ( healthy or one or more comorbidities), and depression. Random samples of 20 healthy individuals were selected from three geographic locations: Florida, New York, and North Carolina. Then, each was given a standardized test to measure...

Standard Deviation in the Business World Joint optimization of mean and standard deviation using response surface methods The importance of statistical information cannot be stressed enough in the business world, but even with our advanced computing systems, information can be entered wrong, or the deviation to large or small. The purpose of this article is to investigate the potential, and problems, with the dual response system (DRS), response surface methodology (RSM), and robust parameter...

HOME ASSIGNMENT Analysis of Auto Parts Industry/ USA /deviations, betas and correlations/ Module: Financial Markets Module leader: Prof. György Komáromi Written by László Földvári Industry Analysis I have choosen five companies from the Capital Goods sector / Autoparts Industry/ Nasdaq. The industry analysis is the essence and first step of getting a clearer view of the market players. We have to know the most important macroeconomical circumstances of industry as well....

EED 280 – Standards, Observation, Assessment: 0 - 8 (37317) Chap 3: How Standardized Tests are Used, Designed, and Selected 1. What is a standardized test? Describe different types of standardized tests. they are psychological test that measure abilities achievements aptitude interest attitude values and personality characteristic . personality test: measures a person's tendency...

ASSIGNMENT 1 Instructions: The Assignment consists of two parts. Please attempt both PART A and PART B. Analyze the results of your statistical processing and provide practical managerial implications wherever applicable. Your assignment should have a cover page including the Group number and the names of the Group members. The assignment should be handed over as a printed copy on the due date. In addition an electronic copy should also be submitted to the HULT online course page. The file...

 In this task, in result to a National Health Care Association being concerned about the shortage of nurses, I have a sample of 50 nurses degree of satisfaction in relation to work, pay and opportunities for promotion. This sample showed their degree of satisfaction on a scale from 0 to 100 from nurses from 3 different types of hospitals: Private, Veterans Administration and University. I have analysed this data to create results to better understand the current degree of job satisfaction...

Case Problem: Make or Buy Analysis Larsen Fabricating Company is reviewing the economic feasibility of manufacturing a part that it currently purchases from a supplier. Forecasted annual demand for the part is 3200 units. Larsen operates 250 days per year. Larsen's financial analysts have established a cost of capital of 14% for the use of funds for investments within the company. In addition, over the past year $600,000 has been the average investment in the company's inventory....

4) [Wooldridge C3.8] (i) Wiew/Descriptive statistics INCOME PRPBLCK Mean 47053.78 0.113486 Median 46272.00 0.041444 Maximum 136529.0 0.981658 Minimum 15919.00 0.000000 Std. Dev. 13179.29 0.182416 Skewness 0.962831 2.700012 Kurtosis 7.551386 10.56841 Jarque-Bera 416.2135 1473.100 Probability 0.000000 0.000000 Sum 19244998 46.41594 Sum Sq. Dev. 7.09E+10 13.57651 Observations 409 409 The average of prpblck is .113 with...

Paras Gaba AP Biology, Block 1 3 February, 2013 Mrs. Killough Shape of Leaf Disks and Photosynthesis Research Question: Does the shape of the leaf disks affect the rate of photosynthesis if the surface area of the leaves are kept the same? Purpose: Through this experiment, I seek to answer whether the shape of leaf disk affects the rate of photosynthesis to find out which leaves are more efficient at utilizing free energy from the environment....

In your own words, interpret the data and note the shape of the distribution of the data provided from the Case Study: Highest Paid Women (Chapter 2, p. 35). To help guide your interpretation, include the following: Frequency distribution table, Stem and leaf plot Histogram Sample mean and median Sample standard deviation. You must calculate results by hand (though you may use any technology of your choice to verify your answers). The data table lists the highest paid woman of this...

Abstract Recent investigations have shown that exerting self control reduces the ability to regulate behaviour in subsequent self control tasks. A state of depleted self control resources is known as ‘ego depletion’ and the purpose of this study was to see how our capacity to inhibit urges can be affected by ego depletion. This study was also done to test the effects of beliefs about self control on subsequent performance in self control tasks. Participants’ performance on the Stroop task...

ECON2206/3290 Introductory Econometrics Assignment 1 Due Week 5 [Total 10 points including 1 point for presentation] To investigate whether fast‐food restaurants charge higher prices in areas with a larger concentration of blacks, you obtain ZIP‐level data on prices for various items at fast‐food restaurants, along with characteristics of the zip code population, in two US cities New Jersey and Pennsylvania. The data set is in DISCRIM.RAW which can be found on Blackboard in the ...

PROBABILITY AND STATISTICS Lab, Seminar, Lecture 4. Behavior of the sample average X-bar  The topic of 4th seminar&lab is the average of the population that has a certain characteristic.  This average is the population parameter of interest, denoted by the greek letter mu.  We estimate this parameter with the statistic x-bar, the average in the sample. Probability and statistics - Karol Flisikowski X-bar Definition 1 x   xi n i 1 Probability and statistics - Karol...

Control Charts Control Charts are use to distinguishes between specialcause or common-cause of variation that is present in a process. There are two basic types of control charts:- Variables - Quantitative data (Measured) Attributes - Qualitative data (Counted) Variable Control Charts Use actual measurements for charting Types:- Average & Range charts Median & Range charts Average & Standard deviation charts Individual & Moving Range charts Run Charts...

Calculate and interpret the following for the data in Column K, “The degree of agreement among patrons that Remington’s has large portions,” on the Remington Data worksheet of the Remington’s Data Set workbook: Mean -3.26 Standard deviation-0.911 Range -3 4 Mean 3.261306533 Standard Error 0.064596309 Median 4 Mode 4 Standard Deviation 0.911243075 Sample Variance 0.830363941 Kurtosis -1.16899198 Skewness -0.663704706 Range 3 Minimum 1 Maximum 4 Sum 649 Count 199 Largest(1) 4 Smallest(1) 1...

DardenBusinessPublishing:210258 UVA-F-1341 This document is authorized for use only by shuang lin at UMD. Please do not copy or redistribute. Contact permissions@dardenbusinesspublishing.com for questions or additional permissions. MARKOV’S TRILEMMA George Markov eagerly awaited his first day at his new job with Athena Asset Management in a major metropolitan area in the northeastern United States. His future boss had given him a list of questions that would prepare him well for...

LEAD 6341 Research Methods and Statistics Midterm Exam Part II: Conceptual Problems (Open Book) Spring, 2013 1) Very briefly discuss the history of ethical problems in research in the US. Describe how current research policies and practices reduce the likelihood of ethical problems arising from research today. The Tuskegee study is an example of ethical problem in research in the US. The black subjects were promised medical care, meals, and burial insurance for their participation...

Quality Associates Inc. | To: | Peter Dalley | From: | Harp Bhander | Date: | 5/17/2013 | Re: | Analysis Results | Quality Associates, a consulting firm has been approached by a client to analyze their manufacturing process. The client came to Quality Associates with a sample of 800 observations that they had collected during times when the manufacturing process was running smoothly. The sample of 800 yielded a sample standard deviation of 0.21. Quality Associates suggested that...

 Case 13: Southeastern Specialty, Inc. Financial Risk (1, 2, 3, 4, & 6) 1. Is the return on the one-year T-bill risk free? No, the return on the one-year T-bill is not risk free. Financial risk is related to the probability of earning a return less than expected and the larger the chance of earning a return far below that expected, the greater the amount of financial risk. Risk free assumes 100% probability that the investment will earn the total percent of return that is expected. 2....

Answer Key – Chapter 1-2 Assignment (Matching), Miller 6e EXS 312 – 101, CHAPTER 1 Measurement, Evaluation, Assessment, and Statistics MATCHING: Select the answer from Column II that best matches a term in Column I. MATCHING: Select the answer from one column that best matches a term in the other column. I II _____ 1. statistics A. quantitative _____ 2. test B. measure, evaluate, identify, prescribe _____ 3. measurement C....

Shannon Wood 11/21/2012 Joel, Griffin, Blake Section #005 ISP 217L Lab 4- Phosphorus Where Does Phosphorus Go? My hypothesis is that dissolved Phosphate will change for the total phosphorus when left under a light. I believe that suspended phosphorus has the biggest impact on the eutrophication of lakes. When there is an increase of phosphorus in lakes, this leads to and increase in phytoplankton. This then leads to a decrease in water clarity. The reason that this is relevant is...

Journal of Applied Psychology 1973, Vol. 58, No. 1, 116-121 EFFECTS OF ITEM FORMAT ON ITEM DISCRIMINATION AND DIFFICULTY ARTHUR L. DUDYCHA 1 AND JAMES B. CARPENTER 2 Purdue University The tests and measurement literature is replete with multiple-choice item construction rules, most of which have little or no empirical verification. Item stem orientation (positive/negative), structure (open/closed), and the presence or absence of an inclusive alternative were systematically...

Math 136, Fall 2013 Test 1, Chapters 2 - 4 Show all work in a Blue Book. Problems are worth 12 points each unless indicated otherwise. Box your final answer. 1. For each of the following terms give a definition and an example. a) interquartile range b) residual c) voluntary response bias d) placebo 2. (13 points) The frequency table below summaries...

Chapter 10 31. A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value. 32. Dole Pineapple, Inc., is...

Sample Case Analysis (Case 10.1) First read the case carefully. In this instance Cregg Hart is interested in knowing if the rivet diameter from a potential new supplier is the same as the diameter from their existing supplier. This lends itself naturally to do a confidence interval or suitable confidence level, say 95% or do a hypothesis test assuming the mean diameters from the two suppliers are the same. Next open the Excel file which you can download from CANVAS Excel files and into...

Part (a) How old are the students studying MU 123 ? Knowing that the number of students in MU 123 is 80 a questionair is been made to know the ages of those students as they are consider small segment from the AOU and we can from that know from this study know the avarage age of AOU students. 28 students were in the age of 18 – 21 18 student were in the age of 22 – 28 11 students were in the age of 25 – 28 9 students were in the age of 28 – 31 7 student s were in the age of 32 – 35...

------------------------------------------------- Internal Assessment Math Studies Does Music Help Recall Or Is It Just Noise? Candidate name: Raquel Gray 001275017 Miramar High School Dr. Marie Borrazzo May 2013 Table of Content Introduction Measurements & Data Collection Mathematic Procedures...

QuantPsych assignment #1 Psychological Statistics @ SNU, 2013 Spring Thursday, March 21, 13 QuantPsych Questions IQ is intended to be normally distributed with a mean of 100 and a standard deviation of 15 • • • • Generate a data set of 400 imaginary subjects’ IQ Report the following descriptive statistics of the generated data set • • mean, variance, range, quartile scores, interquartile range Tip. summary() can be helpful Draw a histogram and a box plot Based on...

COFFEE USE - HEART RATE RESEARCH PROJECT COFFEE USE - HEART RATE Part 1 The study used for this project is a nursing and health sciences study. One particular healthcare facility is trying to determine if it is a good idea to provide coffee in the waiting room for the patients. There are several other facilities that serve tea, coffee, and water, so this health care facility wants to determine if there is sufficient evidence to show that coffee increases the patient heart rates. The...

Key Questions Calculate the mean monthly returns and return standard deviations for each of the 30 stocks in the tab "Tbill, S&P, Dow 30 mo retns" of the Capital Market Returns Data spreadsheet. A) Create a column of monthly returns for a portfolio that each month was invested equally across the 30 stocks. Calculate the mean and standard deviation of returns of this portfolio and explain how they relate to the mean returns and standard deviations of return of the 30 stocks individually....

Statistical P S i i l Process Control C l 26 August 2009 University Malaysia Perlis P li Presented by Dr Zaharah Wahid DRZ CONSULTANT 1 An Overview of Statistical Process Control (SPC) DRZ CONSULTANT 2 What is SPC Statistical : A universal language to describe and analyse the physical variability of a process. Process : The transformation of inputs including f f man, machinery, methods, materials, energy and information to attain a desired result result. Control : To make a...

Module 6: Measures of Variability, Skewness and Kurtosis | Ungrouped Data: VARIABILITY | | Meaning | Lesson | | Formula | Legend | Meaning | NOTE: | VARIABILITY(Four measures of Variability) | Measures of the average distance of each observation from the center of the distribution. | Range(R) | | R=Hv-Lv | Hv- Highest valueLv- Lowest value | Difference between hv and lv in data set. | | | | Variance | population (δ2) | =∑(x-x)2N | x – classmarkx –meanN - population | Average...

Students at a major university are complaining of a serious housing crunch. Many of the university's students, they complain, have to commute too far to school because there is not enough housing near campus. The university officials respond with the following information: the mean distance commuted to school by students is miles, and the standard deviation of the distance commuted is miles. The empirical rule states that Figure 1 • approximately of the measurements in a...

Business Decision Models ____________________________________________________________ ________________________ Question 1 (10 marks) Sandra Enright of Techtronics Inc., an electronics supply firm, has been examining the times required for stock pickers to fill orders requested from inventory. She has determined that individual order-filling times approximately follow a normal distribution with a mean value of 3.2 minutes and...

In this paperwork of BUS 308 Week 1 Quiz you will find the answers on the next questions: 1. The two types of quantitative variables are ordinal and ratio. interval and ordinal. nominative and ordinal. interval and ratio. nominative and interval. 2. As a general rule, when creating a stem-and-leaf display, there should be between ______ stem values. 3 and 100 1 and 100 no fewer than 20 5 and 20 3. The median is the value below which and above which approximately 50...

The key is the use of statistically derived random sampling procedures. These ensure that survey results can be defended as statistically representative of the population. Surveys that do not follow these procedures can produce results that lead to misguided market research, strategic, or policy decisions. Any so-called "survey" in which no attempt is made to randomly select respondents, such as call-in readers' or viewers' "polls", is likely to produce results that in no way reflect overall...

CHAPTER 10 RISK AND RETURN: LESSONS FROM MARKET HISTORY 8. We will calculate the sum of the returns for each asset and the observed risk premium first. Doing so, we get: Year Large co. stock return T-bill return Risk premium 1973 –14.69% 7.29% (21.98% 1974 –26.47 7.99 –34.46 1975 37.23 5.87 31.36 1976 23.93 5.07 18.86 1977 –7.16 5.45 –12.61 1978 6.57 7.64 –1.07 19.41% 39.31% –19.90% a. The average return for large company stocks over this period was:...

Chebyshev’s Theorem and The Empirical Rule Suppose we ask 1000 people what their age is. If this is a representative sample then there will be very few people of 1-2 years old just as there will not be many 95 year olds. Most will have an age somewhere in their 30’s or 40’s. A list of the number of people of a certain age may look like this: |Age |Number of people | |0 |1 | |1 |2 | |2 |3...

BUSS1020 Written Assignment Task 1 According to the data downloaded from the website, it involved some information about the all ordinaries index. For instance, it covered the date, open, high, low, close, and volume and adjust close. In the question, it defined date 1 as the first trading day of the study period. Date 0 which is one day before the first trading day Date 1. First of all, using excel to set up the time index column to arrange the date of the trading day. The range of the data...

1. A radio station that plays classical music has a “By Request” program each Saturday night. The percentage of requests for composers on a particular night are listed below: Composers Percentage of Requests Bach 5 Beethoven 26 Brahms 9 Dvorak 2 Mendelssohn 3 Mozart 21 Schubert 12 Schumann 7 Tchaikovsky 14 Wagner 1 a. Does the data listed above comprise a valid probability distribution? Explain....

AP/IB Biology Lab Assessment The effect of various fruit and vegetable cell membranes on their water potential Independent variable: Type of fruit or vegetable. (Produce used: Russet potatoes, Pascal celery, Gala apple, Navel orange, and Imperator carrot). The fruit or vegetable will be placed in six 56.7 gram cups, ranging with sucrose molarities of 0 (distilled water), 0.2, 0.4, 0.6, 0.8, 1.0, with 5 trials, leading to 30 cups for each produce variable. Dependent variable: The water...

Statistics for Business and Economics Personal pre-assignment 1.9 What is a representative sample? What is its value? The representative sample is a subset of a population of interest that is exhibiting the typical characteristics of the population. The most typical way to cover the up-mentioned criterion is the simple random sample which consist of a sample of units that is selected randomly, e. g. the sample is selected form the population on a way that every sample of the size is having...

Gulf Real Estate Properties Tam Vo MATH410 Aug 14, 2011 Introduction Gulf Real Estate Properties, Inc., a company that specialized in condominium sales in southwest Florida, provided a sample date set on two types of condominium: 40 of Gulf View; those located directly on the Gulf of Mexico, and 18 of No Gulf View; those located near but not on the Gulf. In order to provide in depth statistically analysis, this paper will summarize descriptive statistics from the company's sample data,...

BA 555 Practical Business Analysis Group Project 2: Business Simulation **** Due: November 12, 2014 **** NAME Tailong Wu (Section 001) NAME Ling Yang (Section 002) NAME Daijie Qi (Section 002) 1. The file Group Project 2 Model.xlsx contains 50 monthly returns of the SCHO and SPY EFT funds from September 2010 to October 2014. Suppose that in each of the next 72 months (six years), it is equally likely that any of the historical returns will occur. Develop a spreadsheet model to simulate...

Chapter 11 Two-Way ANOVA An analysis method for a quantitative outcome and two categorical explanatory variables. If an experiment has a quantitative outcome and two categorical explanatory variables that are defined in such a way that each experimental unit (subject) can be exposed to any combination of one level of one explanatory variable and one level of the other explanatory variable, then the most common analysis method is two-way ANOVA. Because there are two different explanatory...

Operations management Homework assignment # 5 – Revenue management Q 15.4 – Designer dress A fashion retailer in Santa Barbara, California, presents a new designer dress at one of the “by invitation only” fashion shows. After the show, the dress will be sold at the company’s boutique store for $10,000 apiece. Demand at the boutique is limited due to the short time the dress remains fashionable and is estimated to be normal with mean 70 and standard deviation 40. There were only 100 dresses...

Instructions for Efficient-Frontier Construction a. Estimation The goal is to obtain the raw ingredients – expected returns, standard deviations and correlations. Historical data are used for this purpose. As a rule of thumb, five years of daily data are probably right (one year should be the absolute minimum). Keep in mind the following: 1) make sure to use the adjusted close prices to calculate returns (so that you won’t have large, spurious negative returns due to dividend payments or...

Diana Mosheyev Pd 7. Statistics Essay | | | | | | |...

* Columns correspond to Variables * Rows correspond to individuals * Rows are often called observations or cases * The number of rows is traditionally denoted by n * In the bar chart the height of each bar is proportional to the count (or percent) in each category * In the pie chart the area of each piece is proportional to the percent of individuals in each category * Pareto chart when the categories are sorted by frequency * Pie charts are less useful than bar...

1. What demographic variables were measured at least at the interval level of measurement? Interval level of measurement allow for the degree of difference between items but not the ratio. The interval levels of measurement that are included in this study sample are Age, Income, Length of labor, Return to work, and Number of hours working per week. 2. 2. What statistics were used to describe the length of labor in this study? Were these appropriate? Descriptive statistics was utilized...

 1. Use the data given to calculate annual returns for Goodman, Landry, and the Market Index, and then calculate average annual returns for the two stocks and the index. (Hint: Remember, returns are calculated by subtracting the beginning price from the ending price to get the capital gain or loss, adding the dividend to the capital gain or loss, and then dividing the result by the beginning price. Assume that dividends are already included in the index. Also, you cannot calculate the rate of...

Materials & Methods Brook trout blood was used throughout our experiment as our erythrocyte suspension, which consisted of ten drops of fish blood in a test tube containing 10mL of 0.7% NaCl. Eleven other solutions, (erythritol, xylose, monacetin, diacetin, triacetin, urea, thiourea, glycerol, ethylene glycol, glucose and fructose) all isosmotic but not necessarily isotonic with the cytoplasm of the erythrocyte, were combined with a 0.2mL of well-mixed stock suspension were added to 0.27M of...

 Descriptive Statistics Kelly Calle QNT/561 February 15, 2015 John Carroll Descriptive Statistics and Interpretation Descriptive statistics is the term given to the analysis of data that helps describe, show, or summarize data in a meaningful way. Descriptive statistics does not allow conclusions beyond the data analyzed or reach conclusions regarding any hypotheses made. It is only a way to describe the data gathered. Descriptive statistics allows data to be presented in a more...

Statistical Reasoning in Everyday Life This chapter taught me the importance of understanding statistical data and how to evaluate it with common sense. Almost everyday we are subjected to statistical data in newspapers and on TV. My usual reaction was to accept those statistics as being valid. Which I think is a fair assessment for most people. However, reading this chapter opens my eyes to the fact that statistical data can be very misleading. It shows how data can be skewed to support a...

Exercise: 11 1. What demographic variables were measured at least at the interval level of measurements? Marital status should be the interval level of measurement. The distance between being single and married is significant when it comes to fatigue and shared duties if the married couples are living together. 2. What statistics were used to describe the length of labor in this study? Were these appropriate? Both the experimental and control groups used means and standard deviations to...

Valerie Simmons Math533 Dr. Mark Beintema July 22, 2012 Course Project PART A The report below represents the detailed statistical analysis of the data collected from a sample of credit customers in the department chain store AJ DAVIS. The 1st individual variable is LOCATION which is a categorical variable. The three subcategories are Urban, Suburban and Rural. Since Location is a categorical variable, the measures of central tendency have not been calculated for this variable. The...

Chapter 5 Measures of Central Tendency: Introduction A measure of central tendency is a single value that attempts to describe a set of data by identifying the central position within that set of data. As such, measures of central tendency are sometimes called measures of central location. They are also classed as summary statistics. The mean (often called the average) is most likely the measure of central tendency that you are most familiar with, but there are others, such as the median and...

 NORTHCENTRAL UNIVERSITY ASSIGNMENT COVER SHEET Student: ODEDOYIN ABEL THIS FORM MUST BE COMPLETELY FILLED IN Follow these procedures: If requested by your instructor, please include an assignment cover sheet. This will become the first page of your assignment. In addition, your assignment header should include your last name, first initial, course code, dash, and assignment number. This should be left justified, with the page number right justified. For example: Student: ODEDOYIN A...

AJ Davis Department Stores Course Project Part A: Exploratory Data Analysis Tiffahanie Seger GM533 Applied Managerial Statistics Professor Keyhani Project Part A: Exploratory Data Analysis: A. Brief Introduction AJ Davis, a popular department store chain, retains many credit customers. Therefore, they completed an in-depth study to find out more about these customers who are essential to their future success as a company. A sample of fifty customers were...