Redo Exercise 5 from Chapter 7 using the rank-sum test instead of a t test. Does your statistical conclusion differ from the one you made in the previous chapter? Why would the rank-sum test not be very accurate for the data in that exercise?

Data from exercise 5

Suppose that the industrial psychologist from the previous exercise is testing the difference in performance on the job-selection test of two different ethnic groups. Given the following data, can the psychologist reject the null hypothesis (alpha = .05) that the population means of these two groups are the same for the job-selection test she is investigating? If these results are statistically significant, compute the 95% CI for the difference of the population means.

Group 1 Group 2| 62 46 54 53 59 50 56 52 59 54