15.44 Utah was the first U.S. state to implement a particularly strict drunk-driving law. As reporter Christopher Ingraham (2017) wrote, “At a [blood alcohol content (BAC)] of 0.08, a driver’s odds of getting into a crash are about four times greater than a sober driver’s. At 0.05, however, the crash risk is halved relative to the risk at 0.08—although it’s worth pointing out that even at 0.05, your odds of a crash are still double what they’d be if you were completely sober.” (Based on these data, some countries, such as Hungary, allow no alcohol for drivers— absolutely none.)

a. What is the relative risk of crashing with a BAC of 0.08 as compared to a BAC of zero—that is, if you were entirely sober?

b. What is the relative risk of crashing with a BAC of 0.05 as compared to a BAC of zero—that is, if you were entirely sober?

c. What is the relative risk of crashing with a BAC of 0.08 as compared to a BAC of 0.05?