As an Aid to the Establishment of Personnel Requirements, the Director

Short Answer

As an aid to the establishment of personnel requirements, the director of a hospital wishes to estimate
the mean number of people who are admitted to the emergency room during a 24-hour period. The
director randomly selects 64 different 24-hour periods and determines the number of admissions for
each. For this sample, $\bar { X } = 396 \text { and } S = 100$ . Using the sample standard deviation as an estimate for
the population standard deviation, what size sample should the director choose if she wishes to
estimate the mean number of admissions per 24-hour period to within 1 admission with 99%
reliability,?