Since the Wilcoxon rank sum test uses only the ranks of the data values and not the actual magnitudes of
the data values, it is never as powerful as the corresponding t-test.

Question

Quizplus · Accepted Answer

This statement is false. The Wilcoxon rank sum test can be more powerful than the t-test in certain situations, such as when the data are not normally distributed or when there are outliers present. Nonetheless, the relative power of the two tests can depend on the specific characteristics of the data and the nature of the research question.

Since the Wilcoxon Rank Sum Test Uses Only the Ranks