Braking distance was evaluated for 4 different brake materials. Run an analysis of variance to determine if there is a difference in treatments? Use the six steps of hypothesis testing at a 0.05 level of significance. Put the below data into Excel to perform the analysis.

Is the average braking distance for material 2 different than the average braking distance for material 3? Prove your conclusion by using the confidence interval formula in chapter 12.

Braking Distance Disk Disk Disk Disk Material 1 Material 2 Material 3 Material 4 69.8 78.1 77.7 90.6 65.6 81.0 80.9 91.0 71.7 81.9 80.8 89.4 70.5 81.8 79.8 88.1 68.0 78.8 81.1 87.5 69.3 78.9 82.0 92.0 71.0 81.4 80.0 90.7 68.8 82.2 80.8 88.4 66.7 79.8 80.9 89.7 72.0 76.7 79.8 88.1 72.8 80.1 80.1 89.4 67.2 78.7 80.4 89.2