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Mathematics, 28.10.2019 22:31 ellemarshall13
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. they would like the estimate to have a maximum error of 0.15 gallons. a previous study found that for an average family the standard deviation is 2.3 gallons and the mean is 17.6 gallons per day. if they are using a 80% level of confidence, how large of a sample is required to estimate the mean usage of water? round your answer up to the next integer.
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