Which of the following dispersions of scores for three groups (A,B,and C)best illustrate the null hypothesis for a Kruskal-Wallis H test?
A) The number of scores above and below the median are equal.
B) The mean differences between two groups are equal.
C) The sum of ranks in each group does not differ between groups.
D) The ranks in two groups are equal to 0.

Question

Quizplus · Accepted Answer

Kruskal-Wallis H test is a nonparametric test used to compare three or more independent groups. The null hypothesis of this test is that there is no difference between the population medians of the groups. Option C states that the sum of ranks in each group does not differ between groups, which is consistent with the null hypothesis. Therefore, it best illustrates the null hypothesis for a Kruskal-Wallis H test.

Which of the Following Dispersions of Scores for Three Groups