test value

A recent gasoline survey said that the national average price of gasoline was $1.498 a gallon. It was felt that gasoline in Texas was significantly lower than the national average. A survey of 10 different suburbs in Dallas, Texas found the average price of gasoline to be $1.294 a gallon with a standard deviation of $0.0526. What is the critical value using a=.05? And what is the test value?