Question: Find a 90 % confidence interval for the mean increase in heart rate in a sample of trained athletes subjected to a standard work load.

Find a 90 % confidence interval for the mean increase in heart rate in a sample of trained athletes subjected to a standard work load. Suppose that the standard deviation of the population is know from earlier studies to be 15 beats per minute, and that 25 athletes participate in the current study, and that the sample mean heart rate increase is 85 beats per minute

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