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It is estimated that the average person in the United States uses 123 gallons of water...

It is estimated that the average person in the United States uses 123 gallons of water per day. Some environmentalists believe this figure is too high and conduct a survey of 40 randomly selected Americans. They find a mean of 113.03 gallons and a population standard deviation of 25.99 gallons. Calculate the appropriate test statistic to test the hypotheses using the critical value rule.

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