An experiment is conducted to show that blood pressure levels can be consciously reduced in people trained in this program. The blood pressure measurements (in millimeters of mercury) listed in the...

An experiment is conducted to show that blood pressure levels can be consciously reduced in people trained in this program. The blood pressure measurements (in millimeters of mercury) listed in the table represent readings before and after the biofeedback training of five subjects. Test whether the mean blood pressure is different after training. Subject

Before/After

1 137 130

2 201 180

3 167 150

4 150 153

5 173 162

What is :

Critical value at a 90% confidence level

Critical value at a 95% confidence level

Test statistic