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The water works commission needs to know the mean household usage of water by the residents...

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 2.3 gallons. The mean water usage per family was found to be 16.7 gallons per day for a sample of 784 families. Construct the 95% confidence interval for the mean usage of water. Round your answers to one decimal place.

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