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Quantative Analysis of Data

Descriptive Stats

(a) Use Excel to prepare an appropriate type of chart (bar, line, pie, scatter) to display the following data. (b) Would more than one kind of display be acceptable? Why or why not? U.S. Fatal Crash Statistics, 2000 Fatal Age Group Percent of Drivers Percent of Fatal Crashes 15-20 6.8 14.6 21-2

Uniform Distribution.

The driving time for an individual from his home to his work is uniformly distributed between 300 and 480 seconds. a. Show the graph of the probability function. b. Find P(300<=x<=435) c. Determine the expected driving time and its standard deviation.

Statistics Problems

1. A data set has a mean of 40, median of 20, and a mode of 20. Would the data likely be a. Symmetrical b. Skewed 2. If the mean, mode, and median are the same value, you have a normal distribution a. True b. False 3. An average or mean can be misleading as to the actual distribution of the data a. True b. False 4

Measurements and Control Limits

A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter. The quality control inspector randomly selected five slugs each hour, measured the outside diameter, and recorded the results. The measureme

Mean and Standard Deviation

The following tables provide information about the top women-owned businessesin the U.S. The first table gives year 2000 revenue in millions of dollars and number of employees for Pennsylvania women-owned companies with year 2000 revenues of $70 million or higher. The second table gives the same information for Michigan women-

Independent and Dependent Variables of Experiments

Module 1 Define the concept of sampling error. Be sure that your definition includes the concepts of statistic and parameter. A research study comparing college alcohol use in the United States and Canada reports that more Canadian students drink but American students drink more. Is this study an example of an experiment why

Finding Mean and Standard Deviation

1. The following data are your company's annual health care premium increases over the last 10 years: 5 7 12 9 15 10 10 10 9 18 a. Find the Mean b. Find the Location of the Median c. Find the Median d. Find the Range e

MegaStat: Quiz Scores

Below you are given 25 numbers which represent the Quiz #1 scores of 25 students. Use MegaStat and provide a descriptive data analysis of the data set. Please note that you will need to enter the data set into MegaStat. Include at least the following, with specific references to the data, taken from the MegaStat output. 82

Statistics for Managers: Work-in-Process

In many manufacturing processes, the term work-in-process(WIP) is used. In a book manufacturing plant, the WIP represents the time it takes for sheets from a press to be folded, gathered, sewn, tipped on end sheets, and bound. The data contained below represent samples of 20 books at each of two production plants and the process

Frequency distribution, median and standard deviation

What is a frequency distribution? Go to http://www.gutenberg.org/browse/scores/top and pick one of the categories. What percentage were the top 5 in that category of the total (shown at the top of the page)? If you were to graph the top 100, what would the graph look like? What information does this tell us if we wanted hard c

A discussion of statistics concepts.

Students in a statistics class at a large state university were given a survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier". What does an "outlier" mean? If student height is measured, would this same retired person necessarily have a value that was an "outlier"

Importance of Studying Statistics

Please help answer the following questions - provide at least 300 words. 1) What are the reasons for studying statistics? 2) Select five random numbers between 70-100. Calculate the mean, and midrange of these numbers. Base on the calculations, which measure of central tendency best represents these numbers?

Survey results statistics for average order size

The preliminary survey results just came back on the specialty catalog project, and they look great! The average planned order size was $53.94, well above the $15 that was hoped for. The group leader will probably be delighted-- after all, $53.94 for each of the 1,300,000 target addresses comes out to over $70 million in avera

Calculating the Measure of Central Tendency

Based upon the following chart please respond to the problems listed below the chart. Standard Test Scores Name Gender Absences PE Math Writing Reading Alex Boy 5 49 85 86 80 Anthony Boy 18 51 39 71 75 Douglas Boy 1 82 74 78 79 Jorge Boy 4 56 66 68 60 Joshua Boy 5 83 79 78 77 Luke Boy 0 94 89 84 84 Robert Boy 17 36

Finding mean and standard deviation: Example

A manufacturing process produces items whose weights are normally distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams. What are the mean and standard deviation?

Completing a Chi Square Test and a T-Test

Please use the data in the attached file. Questions: Calculate all measures of central tendency for data that are interval or ratio in measurement. Calculate the standard deviation for data that are interval or ratio in measurement. Assume this is a sample of students, calculate a t-test that compares boys and girls on th

Steps to Calculating Expected Return and Standard Deviation

An analyst believes that the economic conditions during the next year will either be Strong, Normal or Weak and she thinks that the Simpson Company's returns will have the following probability distribution. What's the standard deviation of Simpson's returns as estimated by this analyst? PROBABI

Determining Variance and Standard Deviation

1. The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10. A. Compute the variance for this sample. Show your work. B. Compute the standard deviation for this sample. Show your work. 2. Suppose Babsie generated the following probability distribution: X P(X) 5 0.25 7 0.3 10 0.25

Mean, Median and Mode

You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items. The higher the manual dexterity of a worker the less likelihood that worker will break significant inventory. Becaus

Computation for Teachers Salaries

See the attached file. A. Select the variable state salary for all three years and find the mean, median, and the standard deviation. B. Based on this sample information, develop a 90 percent confidence interval for the population mean yearly salary for all three years. C. Can we conclude that the mean salary for

Multiple Descriptive Statistics Questions

See the attached file. Question 1: In Data Set 11 of Appendix C of the textbook are recorded the inches of rain which fell on the different days of the week for the fifty-two weeks of one year in Boston. Use this data and a 10% significance level to test the idea that the average rainfall is not the same on all the days of

Central Tendency and Dispersion Between Groups

Please provide input and answers to the questions below. You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items. The higher the manual dexterity of a worker the less like

Distribution of Annual Salaries of NBA Players

A researcher has determined that the distribution of annual salaries of NBA players is bell-shaped and symmetrical about the mean salary, do you think that introducing Michael Jordan's last annual salary of more than $30 million would skew this distribution? Explain why or why not. What would be the best measure of central tende

Defining Effect Size and Central Limit Theorem

1. Define Effect Size. Does increasing N increase Effect Size? Explain your answer with the Central Limit Theorem as your tool. 2. Assume that for the Quantitative GRE score, µ = 550 and σ = 50. A sample of 25 students take the GRE after ingesting marijuana, the killer weed. Their mean score is 530?less than a standa

Calculating the measures of central tendency and skew.

You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items. The higher the manual dexterity of a worker the less likelihood that worker will break significant inventory. Becaus

Mean Average

Q4) In a statistics course, there are five examinations. A student receives scores of 83, 85, 80, and 81 on the first four exams. What score must the student get on the fifth exam in order to have a mean average of 80 for the five exams? Explain your answer.