It Is Estimated That the Average Person in the US

Multiple Choice

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

A) -0.38
B) 2.43
C) 0.38
D) -15.34
E) -2.43