In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? Use a planning value for the population standard deviation of eight minutes. Round your answer to next whole number. How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of eight minutes. Round your answer to next whole number.

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