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 deviatio

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Question 701177: 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 5.06, how large a sample is needed to get the desired information to be accurate within 0.73 decibels?

Answer by stanbon(75887) About Me  (Show Source):
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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 5.06, how large a sample is needed to get the desired information to be accurate within 0.73 decibels?
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n = [z*s/E]^2
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n = [2.3263*5.06/0.73]^2 = 260
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Cheers,
Stan H.
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