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A professor would like to use a 99 confidence interval to estimate the mean amount...

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A professor would like to use a 99 confidence interval to estimate the mean amount of time IRSC students spend studying each week The professor knows that distribution of time spent studying each week by IRSC students is normally distributed with a standard deviation of 12 9 hours How large a sample should the professor select to ensure the confidence interval has a width of no more than 4 12 hours Round the solution up to the nearest whole number

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