Volunteers were randomly assigned to one of two groups to test the speed with which a pain reliever brought relief. One group took the standard dose of extra-strength acetaminophen (group A) while the other group (group N) took a newly approved pain-relieving drug. The number of minutes until symptoms abated is listed for each member of each group. At α = 0.05 can it be concluded that there is a difference in time until pain is relieved?

Use the Wilcoxon rank sum test. Assume that the samples are independent. Also perform each of these steps.
a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Compute the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.

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Group A 15 20 12 20 17 14 15 17 18 11 GroupN 7 14 13 10 16 12 9 10 9