What is the null hypothesis for a Mann-Whitney U test?
A) The number of scores above and below the median are equal.
B) The ranks in two groups are equally dispersed.
C) The mean differences between two groups are equal.
D) The ranks in two groups are equal to 0.

Question

Quizplus · Accepted Answer

The Mann-Whitney U test's null hypothesis posits that the distributions of two groups are equal, which implies that the ranks of the observations from the two groups are equally dispersed.

What Is the Null Hypothesis for a Mann-Whitney U Test