Mathematics, 24.06.2020 18:01, smithmariah7426
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 0.12 gallons. A previous study found that for an average family the variance is 5.29 gallons and the mean is 17 gallons per day. If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water
Answers: 2
represent the mean
population mean (variable of interest)
represent the standard deviation
(a)
(b)
and 
the critical value for this case would be 
, replacing into formula (b) we got:
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