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QUESTION
In developing patient appointment schedules, a medical center desires an estimate of the mean time that a staff member spends with each patient.
In developing patient appointment schedules, a medical center desires an estimate of the mean time that a staff member spends with each patient. How large a sample should be taken if the precision of the estimate is to be +/- 3 minutes at an 85% level of confidence? Use a planning value for the population standard deviation of 4 minutes.
