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Can you explain the formula for standard deviation and how I would apply it to the following question? (layman terms please) Question: Jeremiah wants to

Can you explain the formula for standard deviation and how I would apply it to the following question? (layman terms please)

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Jeremiah wants to estimate the mean age of students at his large university. He'll samplenstudents and make a95 percentconfidence interval for the mean age. He is willing to use=3 years as an estimate of the standard deviation, and he wants the margin of error to be no more than1year. How many students should he sample?

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