Nine observations were randomly selected from population A and eight observations were randomly selected from population B. The populations are not necessarily normally distributed. Use the .05 significance level, a two-tailed test, and the Wilcoxon rank-sum test to determine whether there is a difference between the two populations.

Population A ....... 12, 14, 15, 19, 23, 29, 33, 40, 51

Population B ...... 13, 16, 19, 21, 22, 33, 35, 43