As part of an overall evaluation of training methods, an experiment was conducted to determine the average exercise capacity of healthy male army inductees. To do this, each male in a random sample of 35 healthy army inductees exercised on a bicycle ergometer (a device for measuring work done by the muscles) under a fixed workload until he tired. Blood pressure, pulse rate, and other indicators were carefully monitored to ensure that no one€™s health was in danger. The exercise capacities (mean time, in minutes) for the 35 inductees are listed here.

a. Use these data to construct a 95% confidence interval for μ, the average ­exercise capacity for healthy male inductees. Interpret your findings.
b. How would your interval change using a 99% confidence interval?

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