SOLUTION: The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation σ is known to be 2 years.

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Question 730064: The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation σ is known to be 2 years. A sample of 50 students is selected and the mean is found to be 23.3 years.
a. Find the 99% confidence interval of the population.
b. Find the 99% confidence interval for the population standard deviation
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