Essay
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.
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-2.43
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Correct Answer:
Verified
Feedback:z = (...
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