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OpenStudy (dboyette):
Would this one be worked out like the last. I dont know what the mean would be. 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 5.35, how large a sample is needed to get the desired information to be accurate within 0.64 decibels? Show all work.
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