A company wants to determine whether its consumer productratings
​(0minus−​10)
have changed from last year to this year. The table below showsthe​ company's product ratings from eight consumers for last yearand this year. At
alphaαequals=​0.05,
is there enough evidence to conclude that the ratings have​changed? Assume the samples are random and​ dependent, and thepopulation is normally distributed. Complete parts​ (a) through​(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 | |
Rating​ (this year) | 44 | 55 | 66 | 22 | 55 | 1010 | 88 | 99 | |
