9. Exercise and Stress A study was conducted to investigate the effects of exercise on stress. The table below lists systolic blood pressure readings (in mmHg) of subjects from the time preceding 25 minutes of aerobic bicycle exercise and preceding the introduction of stress through arithmetic and speech tests (based on data from

“Sympathoadrenergic Mechanisms in Reduced Hemodynamic Stress Responses Data for Exercise 8 4000 B.C. 1850 B.C. 150 A.D.

131 129 128 138 134 138 125 136 136 129 137 139 132 137 141 135 129 142 132 136 137 134 138 145 138 134 137 Data for Exercise 7 Sunny Cloudy Rainy 13.5 12.7 12.1 13.0 12.5 12.2 13.2 12.6 12.3 13.9 12.7 11.9 13.8 13.0 11.6 14.0 13.0 12.2 13-5 Kruskal-Wallis Test 707 after Exercise,” by Kim Brownley et al., Medicine and Science in Sports and Exercise, Vol. 35, No. 6). Use a 0.05 significance level to test the claim that the different groups of subjects have the same median blood pressure. Based on the results, can those groups be considered to be samples all from the same population?

Female Black Male Black Female White Male White 117.00 115.67 119.67 124.33 130.67 120.67 106.00 111.00 102.67 133.00 108.33 99.67 93.67 120.33 107.33 128.33 96.33 124.67 117.00 102.00 92.00 118.33 113.33 127.33