Refer to Exercises 10.54 and 10.55. To obtain a more

Refer to Exercises 10.54 and 10.55. To obtain a more accurate picture of the impact of air bags on preventing deaths, it is necessary to account for the effect of occupants using both seat belts and air bags. If the occupants of the vehicles in which air bags are installed are more likely to be also wearing seat belts, then it is possible that some of the apparent effectiveness of the air bags is in fact due to the increased usage of seat belts. Thus, one more 2 × 2 table is necessary: the table displaying a comparison of proper seat belt usage for occupants with air bags available and for occupants without air bags available. Those data are given here.
Refer to Exercises 10.54 and 10.55. To obtain a more

a. Is there significant evidence of an association between air bag installation and the proper usage of seat belts? Use a = .05
b. Provide justification for your results in part (a).

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