As an aid to the establishment of personnel requirements, the director of a hosp

Question

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, X-bar = 17.8 and s2 = 25.
which of the following assumptions is necessary in order for a confidence interval to be valid?
a-the population sampled from as 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 the above are necessary

Explanation / Answer

THE CORRECT ANSWER WILL BE THAT THERE IS NO CONDITION ABOVE NECESSARY AS THE CONFIDENCE INTERVAL CAN BE CALCULATED FOR BOTH THE T DISTRIBUTION AND THE NORMAL DISTRIBUTION. THEREFORE OPTION D IS CORRECT.

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