A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon to 1 PM lunch period.  The waiting time needs to be shortened to increase customer satisfaction.  A random sample of 10 customers is selected, and stored in bank 1, the results, in minutes, are as follows:

4.21 5.55 3.02 5.13 4.77 2.34 3.54 3.20 4.50 6.62

Another branch is also concerned with the noon to 1 PM lunch period.  A random sample of 11 customers is selected, and stored in bank 2, and the results, in minutes, are as follows:

9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 3.95

Is there evidence of a difference in the median waiting time between the two branches?  Use α = .05

1) What is the hypothesis scenario?

2) State n1, n2, and the critical values for the rejection regions.

3) What is the Wilcoxon Rank Sum Test Statistic?