The Wilcoxon signed rank sum test statistic is approximately normally distributed whenever the sample sizes are larger than:
A)5
B)10
C)30
D)None of these choices.

Question

Quizplus · Accepted Answer

The Wilcoxon signed rank sum test is a non-parametric test used to compare two related samples. The test is based on the ranks of the differences between the pairs of values in the two samples. The normal approximation is valid when the sample size is greater than 30. Therefore, choice C is the best answer. The other options are not accurate, as a sample size of 5 or 10 is too small for a reliable normal approximation.

The Wilcoxon Signed Rank Sum Test Statistic Is Approximately Normally