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 foreach.For this sample, $\bar { X } = 396$ and S = 100.Which of the following assumptions is necessary for aconfidence interval to be valid?
A)The population sampled from has an approximate normal distribution.
B)The population sampled from has an approximate t distribution.
C)The mean of the sample equals the mean of the population.
D)None of these assumptions are necessary.

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The Answer of 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 foreach.For this sample, $\bar { X } = 396$ and S = 100.Which of the following assumptions is necessary for aconfidence interval to be valid?
A)The population sampled from has an approximate normal distribution.
B)The population sampled from has an approximate t distribution.
C)The mean of the sample equals the mean of the population.
D)None of these assumptions are necessary.

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