Reference no: EM132157737

Expert                         Brand A          Brand B

C.C.                             24                    25

S.E.                             24                    24

E.G.                             19                    21

B.I.                              23                    25

C.M.                            21                    23

C.N.                            24                    25

G.N.                            26                    25

R.M.                            24                    25

P.V.                             22                    24

Nine experts rated two brands of coffee in a? taste-testingexperiment. A rating on a 7-pointscale(1 equals = extremely unpleasing, 7 equals = extremely pleasing)is given for each of four? characteristics: taste,? aroma, richness, and acidity. The accompanying data table contains the ratings accumulated over all four characteristics. Complete parts? (a)through? (d)below.

A. At the 0.05 level of significance, is there an evidence of a different in the mean summated ratings between the two brands?

B. What assumptions is necessary about the population distribution in order to perform this test?

C. Determine the p-value and interpret its meaning. 

D. Construct and use a 95% confidence interval estimate of the difference in the mean summated.