a recent survey of gasoline prices indicated that the national average was $4.098 per gallon.

a recent survey of gasoline prices indicated that the national average was $4.098 per gallon. The dallas automobile club claimed that gasoline in texas was significantly lower than the national average. A survey covering 10 different suburbs in dallas found the average price of gasoline to be $3.924 per gallon with a population standard deviation of $0.053. What critical value should be used to test the claim using a=0.01?