12) -
12) 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?
a) -2.33
b) 1.26
c) 2.33
d) -1.26