Which of the following dispersions of scores for three groups (A,B,and C)best illustrates 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

The null hypothesis for a Kruskal-Wallis H test states that there is no difference in the medians of the groups. Option C shows that the sum of ranks within each group is equal and therefore consistent with the null hypothesis. Option A is irrelevant to a Kruskal-Wallis test, option B is about means rather than medians, and option D is impossible as ranks cannot be zero.

Which of the Following Dispersions of Scores for Three Groups