Question 19 (3 points] We would like to test whether the change in pancreatic secretion levels (i.e. changepan) is comparable for the five hormone groups. We summarize the mean changes and the associated standard deviations below. Which hormone group has the greatest mean change (need to look at both >0 and f Between groups 186. 68529 4 46 . 6713224 6.22 0 . 0001 Within groups 2947. 94465 393 7. 50113141 Total 3134. 62994 397 7. 89579329 Bartlett's test for equal variances: chi2 (4) = 163. 2654 Prob>chi2 = 0.000 Comparison of changepan by Hormone (Bonferroni) Row Mean- Col Mean 1 2 3 4 2 1 -1. 19429 0 . 805 3 1 . 797576 1 . 99186 1 . 000 0. 001 4 . 051579 1. 24586 -. 745997 1. 000 0. 529 1.000 5 1 . 19154 2. 38582 . 393963 1. 13996 0 . 323 0. 000 1.000 0. 246 O 0.246 O0.363 O0.0001 O0.529Question 22 (5 points) Continued from Q21. Based on Bonferroni adjustment, which pairs are significantly different from each other at a significance level of 5%? Note: The p-values for the pair-wise comparisons are already based on Bonferroni adjustment so can compare them directly with 5%. O {1.2} and {4.51 O {2.31 and {2.51 O {2.51 and {1.51 O {2.31 Question 23 (4 points) Continued from Q22. Based on the Stata output, which of the following assumptions is clearly violated? O Categorical independent variable 0 Constant variance 0 Random sample 0 Normality