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Statistics

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1. In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. Using a value for the population standard deviation of eight minutes, determine:
a. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence?
b. How large a sample should be taken if the desired margin of error is two minutes at a 99% level of confidence?

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