Question: Can person control certain body functions if that person is trained in a program of biofeedback exercises? An experiment is conducted to show that blood pressure level can be consciously reduced in people trained in this program. The blood pressure measurements (mmHg) were taken on each of six subjects before and after the biofeedback training. The results are below. Assuming normality, test at the 5% significance level to determine if the program reduced blood pressure levels. (13 points)

Subject Before After

1 136.9 130.2

2 201.4 180.7

3 166.8 149.6

4 150.0 153.2

5 173.2 162.6

6 169.3 160.1

b. Would your conclusion have changed if you had tested at the 10% significance level? Explain.

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