n1 = 15, n2 = 18, S = 280, H1: m1 > m2. Exercises 57 present sample
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n1 = 15, n2 = 18, S = 280, H1: m1 > m2.
Exercises 5–7 present sample sizes and the sum of ranks for the ranksum test. Compute μS, σS, and the value of the test statistic z. Then find the Pvalue.
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