A simple random sample of front-seat occupants involved in car crashes is obtained. Among occupants not wearing seat belts, were killed. Among occupants wearing seat belts, were killed. We want to use a significance level to test the claim that seat belts are effective in reducing fatalities.

A.Test the claim using a hypothesis test.

B.Test the claim by constructing a confidence interval.

C. What does the result suggest about the effectiveness of seat belts?