Which of the Following Statements About the Two-Sample Wilcoxon Rank

Multiple Choice

Which of the following statements about the two-sample Wilcoxon rank sum test is/are FALSE?

A) The samples must each be independent simple random samples.
B) The observations from the combined samples are placed in rank order.
C) The Wilcoxon rank sum statistic is the sum,W,of the ranks for the observations in the first sample.
D) The distribution of W has mean
If the populations are Normally distributed.
E) The hypothesis that the two populations have identical distributions is rejected when the statistic W is far from its mean.