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.

Player 1 Player 2 Player 3 Player 4

Mean score before class 83 78 93 87

Mean score after class 80 80 86 86

The correct decision is: Explain why and show your work.

a. Reject H0.

b. Do not reject the H0.