If the Null Hypothesis Is True and We Run the Mann-Whitney

Multiple Choice

If the null hypothesis is true and we run the Mann-Whitney test on our data, the expectation is that

A) the difference scores will all be zero.
B) the test will be significant.
C) the sum of the ranks in the two groups will be approximately equal (assuming equal sample sizes) .
D) the number of subjects in each group will be about the same.