Random samples of 2009 pickup trucks with 4 cylinder, 5 cylinder, 6 cylinder, and 8 cylinder engines were obtained. Each pickup truck was tested for miles per gallons in highway driving.
4 Cylinder 5 Cylinder 6 Cylinder 8 Cylinder
24 21 19 20
23 21 19 19
22 23 19 19
24 21 18 20
24 18 21 16
23 22 20 18
23 23 19 15
24 18 20 21
24 20 19
23 20 19
Is there significant evidence to show that the MPG for pickup trucks is not the same for all four engines sizes? Use α = 0.01