Question: Pulse rates of joggers. Pulse rate is an important mea- sure of the fitness of a person’s cardiovascular system. The mean pulse rate for all U.S. adult males is approximately 72 heart beats per minute. A random sample of 21 U.S. adult males who jog at least 15 miles per week had a mean pulse rate of 52.6 beats per minute and a standard deviation of 3.22 beats per minute.

1. Find a 95% confidence interval for the mean pulse rate of all U.S. adult males who jog at least 15 miles per week.
2. Interpret the interval found in part a. Does it appear that jogging at least 15 miles per week reduces the mean pulse rate for adult males?
3. What assumptions are required for the validity of the confidence interval and the inference, part b?

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