10.95 Repair Costs Car manufacturers try to design the bumpers of their automobiles to prevent costly damage in parking-lot type accidents. To compare two models of automobiles, the cars were purposely subject to a series of four front and rear impacts at 8 kilometres per hour (km/h), and the repair costs were recorded.

Do the data provide sufficient evidence to indicate a difference in the average cost of repair for the Honda Civic and the Hyundai Elantra? Test using a = 0.05.

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Impact Type Honda Civic Hyundai Elantra Front into barrier Rear into barrier $403 447 $247 0 Front into angle barrier 404 407 Rear into pole 227 185