In a bumper test, three test vehicles of each of three types of autos were crashed into a barrier at 5 mph, and the resulting damage was estimated. Crashes were from three angles: head-on, slanted, and rear-end. The results are shown below. Research questions: Is the mean repair cost affected by crash type and/or vehicle type? Are the observed effects (if any) large enough to be of practical importance (as opposed to statistical significance)?

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5 mph Collision Damage (S) Crash Type Head-on Goliath 700 1,400 850 1,430 1,740 1,240 700 1,250 970 Varmint Weasel 1,700 1,650 1,630 1,850 1,700 1,650 860 1,550 1,250 2,280 1,670 1,740 2,000 Slant 2,480 1,650 Rear-end 1.240