Table 2.9 is based on records of accidents in 1988 compiled by the Department of Highway Safety and Motor Vehicles in Florida. Identify the response variable, and find and interpret the difference of proportions, relative risk, and odds ratio. Why are the relative risk and odds ratio approximately equal?

Table 2.9:

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Safety Equipment Injury Nonfatal in Use None Seat belt Fatal 1601 162,527 412,368 510 Source: Florida Department of Highway Safety and Motor Vehi- cles.