Researchers conduct a prospective study of the relationship between alcohol consumption and motor vehicle accidents and find the risk ratio of getting in an accident in the next year for the alcohol drinkers compared to non-drinkers is 4.5 with a confidence interval of 3.2-6.9. This suggests that:

daily alcohol consumption is associated with an increased risk of motor vehicle accidents

Explanation: With a high risk ratio gotten when comparing accident risk between alcohol drinkers and non-alchol drinkers, which equals 4.5, meaning accident involving alcohol drinkers is likely to be 4.5 times that involving non-alcohol drinkers. This fact coupled with a confidence interval in the range 3.2 to 6.9, leading us to believe that the relationship between alcohol consumption and motor accident is not just a mere coincidence. Thus daily alcohol consumption is associated with an increased risk of motor vehicle accident.

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