Which of the following best describes the hypotheses in the Kruskal-Wallis test and Friedman test?
A) Two-tailed.
B) One-tailed.
C) Based on one sample.
D) None of these choices are correct.

Question

Quizplus · Accepted Answer

Both the Kruskal-Wallis test and Friedman test use one-tailed hypotheses. In the Kruskal-Wallis test, the null hypothesis is that the medians of all groups are equal, and the alternative hypothesis is that at least one median is different from the others. In the Friedman test, the null hypothesis is that there is no difference in the population medians among the groups, and the alternative hypothesis is that there is a difference. Therefore, both tests are one-tailed.

Which of the Following Best Describes the Hypotheses in the Kruskal-Wallis