SOLUTION: a researcher is interested in estimating the noise levels in decibels at area urban hospitals. she wants to be 95% confident that her estimate is correct. If the standard deviatio

Question 612405: a researcher is interested in estimating the noise levels in decibels at area urban hospitals. she wants to be 95% confident that her estimate is correct. If the standard deviation is 5.48, how large a sample is needed to get the desired information to be accurate within 0.68 decibels. show work please.
Answer by stanbon(75887) (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 95% confident that her estimate is correct. If the standard deviation is 5.48, how large a sample is needed to get the desired information to be accurate within 0.68 decibels.
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Since E = z*s/sqrt(n)
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n = [z*s/E]^2
n = [1.96*5.48/0.68]^2 = 250 when rounded up
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Cheers,
Stan H.
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