In order to make inferences about the temporal muscles of the cat, a certain dose of tubocurarine is injected into a random sample of nine cats. The following data give the tetanus frequency (in hertz) in the temporal (T) muscles before and after injection of tubocurarine.

Use the Wilcoxon rank sum test at the significance level of 0.05 to test the null hypothesis that the median tetanus frequency (in hertz) in the temporal (T) muscles is larger after injection of tubocurarine. State any assumptions you made to solve the problem.

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T before T after 24 27 38 34 32 37 28 35 2841 28 24 2 1