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, $\overline{X }= 19.8$ and s² = 25. Which of the following assumptions is necessary in order for a confidence interval to be valid? A) The population sampled from has an approximate t distribution. B) The mean of the sample equals the mean of the population. C) The population sampled from has an approximate normal distribution. 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 for each. For this sample, $\overline{X }= 19.8$ and s² = 25. Which of the following assumptions is necessary in order for a confidence interval to be valid? A) The population sampled from has an approximate t distribution. B) The mean of the sample equals the mean of the population. C) The population sampled from has an approximate normal distribution. D) None of these assumptions are necessary.

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