Question: In a study of airbags' effectiveness to protect passengers in cars, records of 11,541 occupants in cars that were in accidents found 41 were killed. A review of records of 9,853 occupants in cars that did not have airbags it was found that 52 were killed. The data was used to estimate the difference in proportions of occupants killed in the two categories of vehicles (no airbags minus airbags).

1. Interpret the interval. What can be concluded about the percentages of passengers killed in cars that had airbags versus cars that did not have airbags?
2. When the data was gathered care was taken so that in both groups the severity of the accident and the conditions surrounding the accident were reasonably similar. With that in mind, can it be said that any difference in chances of death is due strictly to some cars having airbags and others not, or could there be some other characteristic that could contribute to this? (This is a thought question there is nothing in the data to give a hint on this.)

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