An independent testing laboratory is commissioned to compare the durability of four brands of golf balls. Balls of each type will be put into a machine that hits the balls with the same force that a golfer uses on the course. Six balls from each brand are randomly selected for testing. The following table shows the number of hits required until the outer covering of the golf ball cracks. Is there sufficient evidence that the mean durability of the four brands differ significantly? Use 0.05 level of significance.