In: Statistics and Probability
A national study shows that in 2006 the average price of gasoline was $2.51 per gallon. The population standard deviation was shown to be $0.61. A 2007 random study of 81 Maryland gas stations showed the average price of gasoline per gallon to be $2.73. Is there significant evidence to suggest that the average price of a gallon of gasoline is more in Maryland in 2007? Test at the 10% significance level.