Which statement identifies the Wilcoxon Signed Rank test?

Which statement identifies the Wilcoxon Signed Rank test?

• A. Used for independent samples with nominal data
• B. Used for correlated samples with interval data
• C. Used for comparing means with large samples
• D. Used for related samples with ordinal data

Answer: (D)

The Wilcoxon Signed Rank test is a nonparametric method used for paired or related samples when you can rank the differences between the pairs. It looks at whether these differences tend to be on average zero, by working with the order of the differences rather than their actual values. Because it relies on ranks and doesn’t assume normality, it’s appropriate when the data are at least ordinal and the samples are related (paired). This is exactly what the statement describes. If you have independent samples or nominal data, this test isn’t the right choice; for independent samples you’d use a different nonparametric test, and for comparing means with normal data you’d use a t-test or z-test.

The Wilcoxon Signed Rank test is a nonparametric method used for paired or related samples when you can rank the differences between the pairs. It looks at whether these differences tend to be on average zero, by working with the order of the differences rather than their actual values. Because it relies on ranks and doesn’t assume normality, it’s appropriate when the data are at least ordinal and the samples are related (paired). This is exactly what the statement describes. If you have independent samples or nominal data, this test isn’t the right choice; for independent samples you’d use a different nonparametric test, and for comparing means with normal data you’d use a t-test or z-test.