Suppose there is interest in comparing the median response time for three independent groups learning a new specific task. In this case, what is the appropriate nonparametric procedure to use?
A) the Wilcoxon rank sum test
B) the Wilcoxon signed-rank test
C) the Kruskal-Wallis test for differences in medians
D) either a or b

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is the appropriate nonparametric test to use when comparing the medians of three or more independent groups. The Wilcoxon rank sum test (option A) and the Wilcoxon signed-rank test (option B) are appropriate for comparing the medians of two independent and paired samples, respectively. Therefore, the Kruskal-Wallis test (option C) is the best choice for comparing the medians of three independent groups.

Suppose There Is Interest in Comparing the Median Response Time