Suppose there is interest in comparing the median response time for three independent groups learning a new specific task. The appropriate nonparametric procedure is:
A) the Wilcoxon Rank Sums Test
B) the Wilcoxon Signed Rank Test
C) the Kruskal-Wallis Test for Differences in Medians
D) the Friedman test
E) none of these

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is appropriate for comparing the medians of three or more independent groups. The Wilcoxon Rank Sums Test and Wilcoxon Signed Rank Test are appropriate for comparing the medians of two independent groups and paired data, respectively. The Friedman test is appropriate for comparing the medians of three or more related samples.

Suppose There Is Interest in Comparing the Median Response Time