Independent samples of sizes nA = 2 and nB = 2 are taken from two continuous populations.

Question:

Independent samples of sizes nA = 2 and nB = 2 are taken from two continuous populations.
(a) Enumerate all possible collections of ranks associated with population A. Also attach probabilities to these rank collections assuming that the populations are identical.
(b) Obtain the null of WA.
Distribution
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