Question: Show that when H0 is true, the mean and variance of the Wilcoxon rank sum test with sample sizes n1 and n2 are Ew)- n2

Show that when H0 is true, the mean and variance of the Wilcoxon rank sum test with sample sizes n1 and n2 are
Show that when H0 is true, the mean and variance

Ew)- n2 a "in2(mn2+ 1) nin2(ni +n2+1) 12 and Var w)

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