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You want to estimate the mean amount of time college students spend on the Internet each month. How many college students must you survey to

You want to estimate the mean amount of time college students spend on the Internet each month. How many college students must you survey to be 95% confident that your sample mean
is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the Internet is 210 minutes.

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