A health center conducts a study comparing weight loss among subjects randomized to one of three intervention groups: 1) exercise classes; 2) exercise and diet modification classes; and 3) reading materials only (i.e. no formal exercise or diet instruction). Which of the following tests would be most appropriate for determining whether there was a difference in weight loss between the 3 intervention groups? Assume the group sizes are small and distributions are skewed. Question 22 options: Independent t-test Wilcoxon Matched-Pairs Signed Rank test Mann-Whitney rank-sum (U) test Kruskal-Wallace test