Cell Phone Companies Customer Satisfaction. 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 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 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 as shown below.
- 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 boxplots for the four cell-phone services on one graph. Discuss what a comparison of the boxplots tells about the four services. Which service does Consumer Reports recommend as being best in terms of overall customer satisfaction?
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Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
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