Q7

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 710 1, 720 2,290 , 480 1, 680 1, 600 800 1, 650 1, 750 Slant 1, 410 1 , 880 2, 020 1,750 1, 760 1,550 1, 280 1,640 2,410 Rear-end 800 1, 670 1, 280 ,550 1, 630 930 1,260 1,260 Choose the correct row-effect hypotheses. a. Ho: A1 # A2 # A3 # 0