Question: Suppose that you have two independent populations and wish to use the Rank Sum Test to evaluate the null hypothesis that their medians are identical. You select a sample size 4 from the first population and a sample size 5 from the second.

If R=16 (R=Test statistics for the Rank Sum Test, i.e., sum of ranks from one of the groups, what is the p-value of the two-sided test?

Observation # Group Value Rank

1 A 1.1 2

2 A 4.3 4

3 B 0.2 1

4 B 10.4 5

5 B 3.3 3

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