Chapter 12, Problem 11CQ

For Exercises 11 through 17, use the traditional method of hypothesis testing unless otherwise specified. Assume the assumptions have been met.

11. Gasoline Prices Random samples of summer gasoline prices per gallon are listed for three different states. Is there sufficient evidence of a difference in mean prices? Use a = 0.01.

State 1	State 2	State 3
3.20	3.68	3.70
3.25	3.50	3.65
3.18	3.70	3.75
3.15	3.65	3.72