To apply the Wilcoxon rank sum test to determine whether the location of population 1 is different from the location of population 2, what kind of samples must be used?
A) They must be drawn from normal populations.
B) They must be drawn from matched pairs experiment.
C) They must be independent.
D) They must be larger than 30.

Question

Quizplus · Accepted Answer

The Wilcoxon rank sum test is a nonparametric test that does not require normality assumptions. However, it does require the two samples to be independent, which rules out options A and B. The sample size does not matter as long as the data is independent. Therefore, option C is the correct choice.

To Apply the Wilcoxon Rank Sum Test to Determine Whether