Question: How do the ratings of TV and Internet services compare

How do the ratings of TV and Internet services compare? The file Telecom contains the rating of 14 different providers. (Data extracted from “Ratings: TV, Phone, and Internet Services,” Consumer Reports, May 2014, pp. 28– 29.)
a. At the 0.05 level of significance, is there evidence of a difference in the mean service rating between TV and Internet services?
b. What assumption is necessary about the population distribution in order to perform this test?
c. Use a graphical method to evaluate the validity of the assumption in (a).
d. Construct and interpret a 95% confidence interval estimate of the difference in the mean service rating between TV and Internet services.


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  • CreatedJuly 16, 2015
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