題組內容

5. Four experts rated two brands of coffee in a taste-testing experiment. A rating on a
7-point scale (1 = extremely unpleasing, 7 = extremely pleasing) is given for each
of four characteristics: taste, aroma, richness, and acidity. The following data
contain the ratings accumulated over all four characteristics:
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a. At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands?