98

Instructor-created question Question Help 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 accompanying data table contains the ratings accumulated over all four characteristics. Complete parts (a) through (d) below. Click the icon to view the data table. a. At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands? Let u, be the mean rating for brand A and u2 be the mean rating for brand B. Determine the null and alternative hypotheses for this test. O A. Ho: HD = 0 (where HD = H1 - H2) O B. Ho: HD 20 (where HD = H1 - H2) H1: HD # 0 H1: HD 0 O The test statistic =. (Type an integer or a decimal. Round to two decimal places as needed.) or The critical value(s) is(are). or (Type integers or decimals. Round to two decimal places as needed. Use a comma to separate answers as needed.) on Since the test statistic the critical value(s). Ho. There is evidence to conclude that the mean ratings are different between the two on brands. on b. What assumption is necessary about the population distribution in order to perform this test? O A. It must be assumed that the distribution of the differences between the measurements is skewed. Click to select your