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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