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, = 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 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 for each. For this sample, = 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 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