Suppose you want to use the Wilcoxon rank sum test to detect a shift in distribution 1 either to the left or to the right of distribution 2, based on samples of sizes 
= 7 and 
= 9.
a. Should you use 
or 
as the test statistic?
b. What is the rejection region for the test if 
c. What is the rejection region for the test if 
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