The Insurance Institute for Highway Safety (IIHS) routinely conducts crash tests on vehicles to determine the cost of repairs. The following data represent the vehicle repair costs for 2009-model mini- and micro-cars resulting from front-full and rear-full crash tests at 6 miles per hour.Treat these data as a simple random sample of 14 low-impact crashes.Construct and interpret a 90% confidence interval for the mean repair cost of a low-impact bumper crash on a mini- or micro-car.Use the normal probability plot and boxplot to assist in verifying the model requirements.

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Vehicle Smart Fortwo Chevrolet Aveo Mini Cooper Toyota Yaris Honda Fit Hyundai Accent Kia Rio Source: IIHS News Release, June 2009 Front Full $1480 $1071 $2291 $1688 $1124 $3476 $3701 Rear Ful $631 $1370 %929 $3345 $3648 $2057 $3148 5 10 15 20 25 30 35 40 Cost ($ in hundreds)