13. 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 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 mean 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