代写Mgmt 7 Assignment 1 Spring 2025帮做R编程

Mgmt 7

Assignment 1

Spring 2025

Due Saturday April 19

1. Consumer Reports provides overall customer satisfaction scores for AT&T, Sprint, T-Mobile, and Verizon cell phone services in major metropolitan areas throughout the United States. The rating for each service reflects overall customer satisfaction considering a variety of factors such as cost, connectivity problems, dropped calls, static interference, and customer support. A satisfaction scale from 0 to 100 is used with 0 indicating completely dissatisfied and 100 indicating completely satisfied. Suppose that the ratings for the four cell phone services in 20 metropolitan areas are given in the file cellservice

a. Consider T-Mobile first. What is the median rating?

b. Develop a five-number summary for the T-Mobile service.

c. Are there outliers for T-Mobile? Explain.

d. Repeat parts (b) and (c) for the other three cell phone services.

2. Chase International provided percent changes in stock markets around the world.  The data shown are percentage changes over the preceding one year period.

Country   Percent Change   Country   Percent Change

Australia 25.1    Japan   9.3

Austria  -13.4    Luxemburg  7.7

Belgium 9.3    Netherlands  13.9

Canada 8.3    New Zealand  12.6

Denmark 15.3    Norway  -15.4

Europe  10    Pacific   10.3

Finland  -14.5    Portugal  -7.2

France  13.8    Singapore  22.9

Germany 6.3    Spain   11.6

Hong Kong 42.8    Sweden  9.1

Italy  -6.1    United Kingdom 10.6

Ireland  9.6    United States  27.4

a. What are the mean and median percent change among these world markets?

b. What are the first and third quartiles?

c. Are there any outliers (identify mild and extreme outliers)?

d. What percentile would you report for the United States?

3. Time published an article on the academic ability of college athletes.  The article noted that some of the most successful athletics programs have athletes with very good College Board scores. Assume that the following sample data are typical of college board scores for Ohio State football players:

1200, 970, 1040, 1230, 980, 895, 1430, 1050, 970, 950, 1030

a. Compute the mean median and mode.

b. Compute the range and interquartile range

c. Compute the variance and the standard deviation

d. Using Z-scores, state whether or not there are any outliers in this data set.

4. Over the past 40 years, the percentage of homes in the United States with smoke detectors has risen steadily and has plateaued at about 96% as of 2018 (National Fire Protection Association website). With this increase in the use of home smoke detectors, what has happened to the death rate from home fires? The file smokedetectors contains 17 years of data on the estimated percentage of homes with smoke detectors and the estimated home fire deaths per million of the population.

a. Do you expect a positive or negative relationship between smoke detector use and deaths from home fires? Why or why not?

b. Compute and report the correlation coefficient. Is there a positive or negative correlation between smoke detector use and deaths from home fires? Comment.

c. Show a scatter plot of the death rate per million of the population and the percentage of homes with smoke detectors.  What does the plot tell you?