Refer to Exercise 10.54. The authors also collected information about accidents concerning seat belt usage. The article compared fatality rates for occupants using seat belts properly with those for occupants not using seat belts. The data are given here.
a. Calculate the odds of being killed in a harmful- event car accident for vehicle occupants who were using seat belts and those who were not using seat belts. Interpret the two odds.
b. Calculate the odds ratio of being killed in a harmful- event car accident with and without seat belts being used properly. What does this ratio tell you about the importance of using seat belts?
c. Is there significant evidence of a difference between vehicles with and without proper seat belt usage relative to the proportions of persons killed in a harmful-event vehicle accident? Use a = .05.
d. Place a 95% confidence interval on the odds ratio. Interpret this interval.
In exercise

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