Question 315736: as an aid to the estabishment of personnel requirements, the director of a hospital wishes to estimate the mean numbe of people who were admitted to the emergency room during a 24-hour period. The director radmomly selects 64 different 24-hour periods and determines the number of admission fo each. For this sample, the sample mean=9.8 and the sample variance=25. if the director wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99% reliability, what size sample should she choose?
A. n=482
B. n=166
C. n=154
D. n=123
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! For this sample, the sample mean=9.8 and the sample variance=25. if the director wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99% reliability, what size sample should she choose?
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n = [z*s/E]^2
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n = [2.5758*sqrt(25)/1]^2 = 166 after rounding up.
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Cheers,
Stan H.
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A. n=482
B. n=166
C. n=154
D. n=123
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