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A random sample of car crashes is obtained. Among 2792 occupants not wearing seat belts, 33 were killed. Among 7654 occupants wearing seat belts, 18

A random sample of car crashes is obtained. Among 2792 occupants not wearing seat belts, 33 were killed. Among 7654 occupants wearing seat belts, 18 were killed. Use a 0.01 significance level to test the claim that seat belts are effective in reducing fatalities. Consider the occupants not wearing seat belts to be population 1.

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