Question: 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

  1. 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.

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