Risk A study of auto safety determined the number ofdriver deaths per million vehicle sales, classified by typeof vehicle. The data on the next page are for 6 midsizemodels and 6 SUVs. Wondering if there is evidence thatdrivers of SUVs are safer, we hope to create a 95%confidence interval for the difference in driver death ratesfor the two types of vehicles. Are these data appropriatefor this inference? Explain. (Ross and Wenzel, An Analysisof Traffic Deaths by Vehicle Type and Model, March 2002) Midsize 47 54 64 76 88 97SUV 55 60 62 76 91 109

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