Answer part (a) and (d) and show all working and hypothesis statement from the picture below

Data for the question below

re above 0, you can conclude that the mean pil online retailer. 10.21 How do the ratings of TV and phone services compare? 's of The file Telecom contains the rating of 13 different providers. this (Data extracted from "Ratings: TV, Phone, and Internet Services," Consumer Reports, May 2012, p. 25.) a. At the 0.05 level of significance, is there evidence of a difference n ex- in the mean service rating between TV and phone services? efore b. What assumption is necessary about the population distribution ssage in order to perform this test? m the c. Use a graphical method to evaluate the validity of the assump- ment, tion in (a). d. Construct and interpret a 95% confidence interval estimate of the difference in the mean service rating between TV and phone services. mbian g on a 10.22 Super Target versus Walmart: Who has the lowest prices? pleas- Given Walmart's slogan "Save Money-Live Better," you sus- a, rich- pect that Walmart does. The prices of 33 foods were compared tain the (data extracted from "Supermarket Showdown," The Palm Beach Post, February 13, 201 1, pp. IF, 2F) and the results are stored in TargetWalmart heFile Home Insert Page Layout Formulas Data Review View Help Tel K Cut Calibri - 11 A A Be Wrap Text Paste IS Copy Format Painter B JU - G - A - Merge & Center Clipboard Font Alignment L7 X V 1 A B C D Provider TV Phone 2 Verizon FIOS 74 78 3 WOW 74 83 4 Bright House Networks 70 77 5 AT & T U-verse 68 72 6 Cox 67 74 7 SuddenLink 66 81 8 Cablevision/Optimum 64 75 9 Insight 64 73 10 RCN 62 71 11 Comcast 61 70 12 Time Warner 60 71 13 Charter 59 71 14 Mediacom 54 63 15 DATA + Type here to search Eli e