For the given data, (a) determine the test statistic H, X y Z (b) determine the critical value at the a = 0.05 level of significance, and 15 16 18 (c) test whether the distributions of the populations are different. 16 19 15 20 14 12 12 21 17 (a) Determine the test statistic H. H= 0.88 (Round to two decimal places as needed.) (b) Determine the critical value at the a = 0.05 level of significance. The critical value is . (Round to four decimal places as needed.)