The distance required to stop a vehicle on wet pavement was measured to compare the stopping power of four major brands of tires. A tire of each brand was tested on the same vehicle on a controlled wet pavement. The resulting distances follow.

Brand A Brand B Brand C Brand D Distance (replicate) 37 33 41 41 34 40 34 41 38 37 38 40 36 42 35 39 40 38 42 41 32 34 43 At   0.05, is there sufficient evidence to conclude that there is a difference in the mean stopping distance?

a. Solve using the p-value approach.

b. Solve using the classical approach.