QUESTION 5 [9m] Nine experts rated two brands of Colombian 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 display the ratings accumulated over all four characteristics. Coffee SELF Test result: (a) At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands? (b) What assumption is necessary about the population distribution in order to perform this test? (c) Determine the p-value in (a) and interpret its meaning.

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