Independent random samples are selected from two populations. The data are shown in the following table and saved in the LM7_67 file.
Sample 1 | Sample 2 | |||
15
| 16
| 5 | 9 | 5 |
10
| 13
| 12 | 8 | 10 |
12 | 8 | 9 | 4 |
|
a. Use the Wilcoxon rank sum test to determine whether the data provide sufficient evidence to indicate a shift in the locations of the probability distributions of the sampled populations. Test, using α = .05.
b. Do the data provide sufficient evidence to indicate that the probability distribution for population 1 is shifted to the right of the probability distribution for population 2? Use the Wilcoxon rank sum test with α = .05.
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