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viva [34]
3 years ago
9

Hospital administrators wish to learn the average length of stay of all surgical patients. a statistician determines that, for a

95% confidence level estimate of the average length of stay to within +/- 0.5 days, 50 surgical patients' records will have to be examined. how many records should be looked at to obtain a 95% confidence level estimate to within +/- 0.25 days?
Business
1 answer:
Setler [38]3 years ago
7 0

20,000 records should be looked

Solution:

Solve for s :  50 = [1.96*s/0.5]

25 = 1.96s

s = 12.75

Solve for "n":  n = [1.96*12.75/0.25]^2

n = [100]^2

n = 20,000

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