Question: A study on sleep with elementary school students finds that almost all of the Subjects get between 7 and 10 hours of sleep per night.

A study on sleep with elementary school students finds that almost all of the Subjects get between 7 and 10 hours of sleep per night. If we want to be 95% confident in the study result and precise within a Margin of Error of 15 minutes (0.25 hours), how many elementary students would we need to recruit?

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