2.4 Table 2.10 shows fatality results for drivers and passengers in auto accidents in Florida in 2008, according to whether the person was wearing a seat belt.

a. Estimate the probability of fatality, conditional on seat-belt use in category (i) no and (ii) yes.

b. Estimate the probability of wearing a seat belt, conditional on the injury being (i)

fatal and (ii) nonfatal.

c. For the most natural choice of response variable, find and interpret the difference of proportions, relative risk, and odds ratio. Why are the relative risk and odds ratio approximately equal?

Table 2.10 Data for Exercise 2.4 on Auto Accidents Injury Seat-Belt Use Fatal Nonfatal No 1085 55,623 Yes 703 441,239 Source: Florida Department of Highway Safety and Motor Vehicles, www.flhsmv.gov/hsmvdocs/CS2008.pdf.