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

question 84

Multiple Choice

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, = 396 and S = 100.Which of the following assumptions is necessary in order for a confidence 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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