Under what circumstances should the standard normal distribution be used when employing the Mann-Whitney U test?
A) When the sample sizes are equal from the two populations
B) When the sample sizes are greater than 20
C) When the populations are normally distributed
D) You would never use the standard normal distribution.

Question

Quizplus · Accepted Answer

The Mann-Whitney U test, when applied to large samples (typically n > 20), allows for the approximation of the U distribution with the standard normal distribution. This approximation simplifies calculations and is justified by the central limit theorem.

Under What Circumstances Should the Standard Normal Distribution Be Used