The Wilcoxon signed-rank test statistic is approximately normally distributed whenever the sample sizes are larger than or equal to which of the following values?
A) 10
B) 20
C) 25
D) 35

Question

Quizplus · Accepted Answer

The Wilcoxon signed-rank test statistic is approximately normally distributed when the sample size is at least 25. This is due to the central limit theorem, which states that as the sample size increases, the distribution of sample means (or in this case, sample test statistics) approaches a normal distribution. Therefore, option C is the best choice as it satisfies the minimum sample size requirement for the Wilcoxon signed-rank test statistic to be approximately normally distributed.

The Wilcoxon Signed-Rank Test Statistic Is Approximately Normally Distributed Whenever