13-12. A random sample of incomes (expressed in thousands of dollars) is taken from each of two communities (call them A and B):

Community A Community B 20 20.5 35 19 52 55 31 46 51.5 40 47 67 71 54 39 45 30 62 55 57 60 Use the runs test to determine if the population distributions are identical.

Let α = 0.01.