answer a,b,c and show through minitab

Nine 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 stored in Coffee contain the ratings accumulated over all four characteristics: BRAND EXPERT C.C. S.E. E.G. B.L. C.M. C.N. G.N. R.M. P.V. 24 27 19 24 22 26 27 25 22 26 27 22 27 25 27 26 27 23 a. At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands? (-1.5566/(1.424/3) -3.2772 Stat--3.2772-2.306 We reject a hypothesis since there is not enough evidence of a difference in the mean ratings between the two brands What assumption is necessary in order to perform this test? The difference between the two ratings is normally distributed Determine the p-value in (a) and interpret its meaning, b. c