Provide the rejection region for the Wilcoxon rank sum test for each of the following sets of

Question:

Provide the rejection region for the Wilcoxon rank sum test for each of the following sets of hypotheses:
a. H0: ∆ = 0 versus Ha: ∆ ≠ 0 with n1 = 8, n2 = 9, and α = .10
b. H0: ∆ = 0 versus Ha: ∆ < 0 with n1 = 6, n2 = 7, and α = .05
c. H0: ∆ = 0 versus Ha: ∆ > 0 with n1 = 5, n2 = 9, and α = .025