The Wilcoxon, Rank-Sum test used to compares_______________?
Correct answer: C. Two populations
- A. Any number of populations
- B. A sample mean to the population mean
- C. Two populations
- D. Three populations
Explanation
The Wilcoxon rank-sum test is the nonparametric alternative to the two-independent-samples t-test, so it compares two independent populations. It is not designed for three or more populations; Kruskal-Wallis is used for that setting.
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