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Finding the average number of hours

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For a psychology experiment, Emma is assigned the task of finding the average number of hours U.S. college students sleep each night. Her results must be at the 95% level of confidence with a maximum margin of error of 0.5 hours. Assuming the standard deviation is 1.2 hours (based on a previous, reliable study), how many students must Emma survey?

Reference no: EM131429733

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