When employing a small sample Mann-Whitney U test for a two-tailed test, which of the following is true?
A) The sample sizes need to be equal.
B) Select as the test statistic the smaller of the two U values.
C) Select either of the U values to be the test statistic.
D) The alpha level should be doubled.

Question

Quizplus · Accepted Answer

The Mann-Whitney U test involves calculating two U values for the two groups being compared and then selecting the smaller of these two values as the test statistic. This approach is used regardless of the sample sizes, which do not need to be equal. The alpha level is not doubled; instead, the significance of the test statistic is determined based on the chosen alpha level and the distribution of U.

When Employing a Small Sample Mann-Whitney U Test for a Two-Tailed