A 2003 study found that Americans exercised a mean of 115 minutes per week. A more recent study found that a sample of 20 Americans exercised a mean of 120 minutes per week with a standard deviation of 12 minutes. Can you conclude that the mean number of exercise per week is currently more than 115 minutes per week?
a. Use a 0.05 significance level. Assume that the mean number of minutes of exercise is normally distributed.
b. If a is changed to 0.01, does your conclusion change?
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