06 Feb 10.20 Nine experts rated two brands of Colombian c
10.20 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 (stored in ) display the ratings accumulated over all four characteristics. Coffee SELF Test a. At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands? Brand Expert A B C.C. 24 26 S.E. 27 27 E.G. 19 22 B.L. 24 27 C.M. 22 25 C.N. 26 27 G.N. 27 26 R.M. 25 27 P.V. 22 23 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. d. Construct and interpret a 95% confidence interval estimate of the difference in the mean ratings between the two brands
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