9. Hypothesis Test for Difference in Car Taxi Ages When the author visited Dublin in Ireland, he recorded the ages of randomly selected passenger cars and randomly selected taxis. The ages (in years) are listed below. Use a 0.05 significance level to test the claim that there is a difference between the median age of a Dublin car and the median age of a Dublin taxi. We might expect that taxis would be newer, but what do the results suggest?

Taxis 8 8 0 3 8 4 3 3 6 11 7 7 6 9 5 10 8 4 3 4 Cars 4 0 8 11 14 3 4 4 3 5 8 3 3 7 4 6 6 1 8 2 15 11 4 1 6 1 8

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Control Group 0.519 0.476 0.413 0.429 0.501 0.402 0.349 0.594 0.334 0.483 0.460 0.445 Obsessive-Compulsive Patients 0.308 0.210 0.304 0.344 0.407 0.455 0.287 0.288 0.463 0.334 0.340 0.305 Sample 1 values: 2 7 10 16 20 22 23 26 27 30 33 Sample 2 values: 3 4 11 14 28 35 40 46 47 52 53 60 Sample 1 values: 8 15 27 39 45 62 68 72 77 80 87 Sample 2 values: 3 5 9 11 14 21 33 44 61 70 85 13-4 Wilcoxon Rank-Sum Test for Two Independent Samples 701 10. Pulse Rates Refer to Data Set 1 in Appendix B for the pulse rates of men and women.

Use only the first 13 pulse rates of men and use only the first 12 pulse rates of women to test the claim that the two samples of pulse rates come from populations with the same median. Use a 0.05 significance level.