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 ate as shown.
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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