SOLUTION: A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 98% confident that her estimate is correct. If the standard deviation

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Question 662752: A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 98% confident that her estimate is correct. If the standard deviation is 5.17, how large a sample is needed to get the desired information to be accurate within 0.62 decibels?
Im off to try and work my other problems..Thanks for your help!
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 98% confident that her estimate is correct. If the standard deviation is 5.17, how large a sample is needed to get the desired information to be accurate within 0.62 decibels?
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Since E = zs/sqrt(n)
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n = [zs/E]^2
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Your Problem:
n = [2.326*5.17/0.62]^2 = 377 when rounded up
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cheers,
Stan H.