A golf instructor is interested in determining if her new technique for improving players’ golf scores is effective. She takes four new students. She records their 18-hole scores before learning the technique and then after having taken her class.

She conducts a hypothesis test. The data are as follows.

The correct decision is:

a. Reject H₀.

b. Do not reject the H₀.

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: X̅ _d = −10.2 s_d = 8.4. Using the data, test the hypothesis that the blood pressure has decreased after the training.

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Player 1 Player 2 Player 3 Player 4 Mean score before class 83 78 93 87 Mean score after class 80 Table 10.21 80 86 86