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The Insurance Institute for Highway Safety IIHS routinely conducts crash

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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