10.21 How do ratings of TV and phone services compare? File Telecom contains a rating of...

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10.21 How do ratings of TV and phone services compare? FileTelecom contains a rating of 13 different providers. a. At the 0.05level of significance, is there evidence of a difference in themean service rating between TV and phone services?
b. What assumption is necessary about the populationdistribution in order to perform this test?
c. Use a graphical method (show distribution, rejection andacceptance regions) to evaluate the validity of the assumption in(a).
d. Construct and interpret a 95% confidence interval estimate ofthe difference in the mean service rating between TV and phoneservices.
Provider TV Internet
Verizon FIOS 71 71
AT&T U-verse 70 69
Cox Communicaitons 61 62
SuddenLink 63 66
Optimum 66 68
Comcast Xfinity 58 60
TimeWarner 60 62
Mediacom 56 58
Spectrum 63 65
Frontier Communications 60 56

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3.7 Ratings (361 Votes)

a hypothesis is thedifference between mean ratings of TV services and internetservices of a providernecessarycalculation beTV Internet717100817069136161621001636634416668212158602121606221215658212163652121605642401sum 9sum See Answer

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Provider	TV	Internet
Verizon FIOS	71	71
AT&T U-verse	70	69
Cox Communicaitons	61	62
SuddenLink	63	66
Optimum	66	68
Comcast Xfinity	58	60
TimeWarner	60	62
Mediacom	56	58
Spectrum	63	65
Frontier Communications	60	56