Question 20:

Based on the stata output below, which of following assumptions is clearly violated?

a) random sample

b) normality

c) categorical independent sample

d) constant variance

Analysis of Variance Source SS df MS F Prob > F Between groups 186.68529 4 46 . 6713224 6.22 0.0001 Within groups 2947 . 94465 393 7 . 50113141 Total 3134. 62994 397 7. 89579329Bartlett'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 N -1. 19429 0 . 805 (