If the Underlying Distributions Are Known to Be Symmetric, We

question 23

Multiple Choice

If the underlying distributions are known to be symmetric, we can use the Wilcoxon rank-sum test to compare two independent population means.This is so because:

• A) the rank-sum test is designed as a test of two independent means.
• B) the mean and the median have the same value for all symmetric distributions.
• C) the mean is the parameter that is usually evaluated when using nonparametric procedures.
• D) the difference in two population means will always be normally distributed and the Wilcoxon rank-sum test is used to test normally distributed variables.

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