The sample size for the Wilcoxon signed-rank test is:
A) equal to the number of participants.
B) two times the number of participants.
C) the number of difference scores that are not 0.
D) N - 1.

Question

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The Wilcoxon signed-rank test is a non-parametric test used to compare two related samples or repeated measures on a single group. It is used when the data is not normally distributed or the assumptions of normality are violated. The sample size for the Wilcoxon signed-rank test is the number of difference scores that are not 0. It is also called the number of non-zero differences. This is because the test is conducted on the ranks of the difference scores, and only the absolute values of these differences matter. Therefore, the number of non-zero differences is used as the sample size for calculating the test statistic.

The Sample Size for the Wilcoxon Signed-Rank Test Is