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)?
5 mph Collision Damage ($)
Crash Type Goliath Varmint Weasel
Head-On 760 1,730 2,230
1,460 1,600 1,610
820 1,670 1,750
Slant 1,490 1,880 2,080
1,790 1,790 1,520
1,200 1,610 2,450
Rear-end 740 800 1,630
1,210 1,590 1,690
930 1,230 1,220
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