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.

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.

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:


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