Question: A simple random sample of 7 people embarked on a program of regular aerobic exercise. Their heart rates, in beats per minute, were measured before

A simple random sample of 7 people embarked on a program of regular aerobic exercise. Their heart rates, in beats per minute, were measured before and after, with the following results:

Construct a 95% confidence interval for the mean reduction in heart rate.

Person Before 81 84 79 85 79 84 87 After 73 77 73 78 71 75 80

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