Refer to Table 13-2 in Section 13-1 and identify the efficiency of the Wilcoxon rank-sum test. What
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Table 13-2 Efficiency: Comparison of Parametric and Nonparametric Tests Efficiency Rating of Nonparametric Test with Normal Populations Application Matched pairs of sample data test or z test Nonparametric Test Sign test Wilcoxon signed-ranks test Wilcoxon rank-sum test Parametric Test Two independent samples ttest or z test Several independent samples Analysis of variance (Ftest) Kruskal-Wallis test Correlation Randomness 0.63 0.95 0.95 0.95 0.91 No basis for comparison Linear correlation Rank correlation test No parametric test Runs test
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