A company wants to determine whether its consumer product ratings â€‹(0minusâˆ’â€‹10) have changed from last year to this...

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A company wants to determine whether its consumer productratings
â€‹(0minusâˆ’â€‹10)
have changed from last year to this year. The table below showstheâ€‹ company's product ratings from eight consumers for last yearand this year. At
alphaÎ±equals=â€‹0.05,
is there enough evidence to conclude that the ratings haveâ€‹changed? Assume the samples are random andâ€‹ dependent, and thepopulation is normally distributed. Complete partsâ€‹ (a) throughâ€‹(f).
Consumer
1
2
3
4
5
6
7
8
Rating left parenthesis last year right parenthesisRating (lastyear)
55
55
44
22
66
88
55
77
Ratingâ€‹ (this year)
44
55
66
22
55
1010
88
99

Answer & Explanation Solved by verified expert

4.1 Ratings (737 Votes)

In the above problem data are dependent in nature and samplesize is 8 that is this is small sample problemSo we use the dependent ttest for the See Answer

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Consumer	1	2	3	4	5	6	7	8
Rating left parenthesis last year right parenthesisRating (lastyear)	55	55	44	22	66	88	55	77
Ratingâ€‹ (this year)	44	55	66	22	55	1010	88	99