Suppose there is interest in comparing the median response time for three independent groups learning a specific task. The appropriate nonparametric procedure is
A) Friedman rank test.
B) Kruskal-Wallis Rank Test.
C) Wilcoxon Rank Sums Test.
D) Wilcoxon Signed Rank Test.

Question

Quizplus · Accepted Answer

The Kruskal-Wallis Rank Test is a nonparametric test for comparing the medians of three or more independent groups. The Friedman rank test is used when there are repeated measurements on the same subjects, which is not the case here. The Wilcoxon Rank Sums Test and Wilcoxon Signed Rank Test are used for comparing two independent groups and paired data, respectively, which is not the case here either.

Suppose There Is Interest in Comparing the Median Response Time