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We want to estimate the mean amount of time people spend on Facebook each month.. How many randomly selected Facebook users must be surveyed if

We want to estimate the mean amount of time people spend on Facebook each month.. How many randomly

selected Facebook users must be surveyed if we want the sample mean to be in error by no more than 15

minutes, with a 95% confidence? A preliminary study suggests that the population standard deviation is 210

minutes.

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