Question

9. Eight subjects were asked to perform a simple puzzle assembly task under customary conditions and under conditions of stress. During the stressful condition, the subjects were told a mild shock would be delivered 3 minutes after the start of the experiment and every 30 seconds or so thereafter until the task was completed. Blood pressure readings were taken under both conditions. The data in the table represent the highest reading during the experiment. Let mp denote the median difference in blood pressures (Normal-Stress) Subject Normal Stress 126.0 130.0 117.0 118.5 115.0 125.0 118.0 120.0 118.0 121.0 128.0 125.5 125.0 130.0 120.0 121.0 (a) Use the sign test to determine if the data give evidence of higher median blood a0.05 and clearly state pressure readings during conditions of stress. Use your hypotheses Cumulative probabilities for binomial(8,0.5) P(YS vlp 0.5) 0.004 0.035 0.145 0.363 0.637 0.855 0.964 0.996 (b) Use the Wilcoxon test to determine if the data give sufficient evidence of higher median blood pressure readings during conditions of stress. Use α 0.05 and clearly state your hypotheses 0.11.282, z0.051.645, Zo.025 1.96, and zo.01-2.326. Use the normal approzimation even though the sample size is small

Answer 1