Bundle: Statistics for Business & Economics, Loose-Leaf Version, 13th + MindTap Business Statistics with XLSTAT, 1 term (6 months) Printed Access Card
13th Edition
ISBN: 9781337148092
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Textbook Question
Chapter 3.4, Problem 52E
Consumer Reports provided 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 the 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 was used with 0 indicating completely dissatisfied and 100 indicating completely satisfied. The ratings for the four cell-phone services in 20 metropolitan areas are as shown (Consumer Reports, January 2009).
- 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.
- e. Show the box plots for the four cell-phone services on one graph. Discuss what a comparison of the box plots tells about the four services. Which service did Consumer Reports recommend as being best in terms of overall customer satisfaction?
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No, the data do not contain outliers. V
d. Repeat parts (b) and (c) for the other three cell phone services.
Smallest value
First quartile (to 2 decimals)
Median (to 1 decimal)
Third quartile (to 2 decimals)
AT&T
Largest value
Are there outliers for AT&T? Explain.
Limits for AT&T(to 1 decimal)
No, the data do not contain outliers.
Are there outliers for Sprint? Explain.
Limits for Sprint(to 2 decimals)
No, the data do not contain outliers. V
Are there outliers for Verizon? Explain.
Limits for Verizon (to 2 decimals)
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and
Sprint
and
and
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No, the data do not contain outliers. V
e. Which of the following boxplots accurately displays the data set?
#2
Verizon
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As the leader of the sales team, you would like to increase the revenue brought by your team. You discovered a program for sales personnel that supposedly improve interpersonal skills and thus help settle deals with customers more often. You decide to send8 of your sales people for the training, and compare the amount they brought in sales in the month before they went and in the month after they received the training. The data are:
Xbefore: 400, 300, 1200, 2100, 700, 450, 650, 3400
Xafter: 1000, 400, 1000, 2500, 1200, 600, 800, 3000
A. Identify the appropriate statistical measure to use.
B. Conduct the test. Make a decision about the null hypothesis, interpret your results and calculate effect size if applicable. At ?=.05, can you report to upper management that the training worked? Or was it a waste of money?
C. Calculate 95% confidence intervals for the estimate of the difference.
An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for each of the crashes was $421,$465,$412,$218. Compute the range of data
Chapter 3 Solutions
Bundle: Statistics for Business & Economics, Loose-Leaf Version, 13th + MindTap Business Statistics with XLSTAT, 1 term (6 months) Printed Access Card
Ch. 3.1 - Consider a sample with data values of 10, 20, 12,...Ch. 3.1 - Consider a sample with data values of 10, 20, 21,...Ch. 3.1 - Consider the following data and corresponding...Ch. 3.1 - Consider the following data. Period Rate of Return...Ch. 3.1 - Consider a sample with data values of 27, 25, 20,...Ch. 3.1 - Consider a sample with data values of 53, 55, 70,...Ch. 3.1 - The average number of minutes Americans commute to...Ch. 3.1 - The Wall Street Journal reported that the median...Ch. 3.1 - Which companies spend the most money on...Ch. 3.1 - Over a nine-month period, OutdoorGearLab tested...
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