Chapter 10, Problem 119H

Use the following information to answer the next two exercises. An experiment is conducted to show that blood pressure can be consciously reduced in people trained in a “biofeedback exercise program.” Six subjects were randomly selected and blood pressure measurements were recorded before and after the training. The difference between blood pressures was calculated (after - before) producing the following results: ${\bar{x}}_d=-{10.2}_d=8.4$ . Using the data, test the hypothesis that the blood pressure has decreased after the training.

If a = 0.05, the p-value and the conclusion are

a. 0.0014; There is sufficient evidence to conclude that the blood pressure decreased after the training.

b. 0.0014; There is sufficient evidence to conclude that the blood pressure increased after the training.

c. 0.0155; There is sufficient evidence to conclude that the blood pressure decreased after the training.

d. 0.0155; There is sufficient evidence to conclude that the blood pressure increased after the training.