Explain when the t distribution is used compared to the z distribution.
Question: The college president asks the stats teacher to estimate the average age of the students at their college. How large a sample is necessary if we are to be 95% confident that the estimate should be accurate within 0.5 year and the standard deviation is 3.1 years? (Similar to example 7-4 on page 352 .) Make sure you round appropriately!
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