Asimple random sample of front-seat occupants involved in car crashes is obtained. among 2902 occupants not wearing seat belts, 30 were killed. among 7866 occupants wearing seat belts, 20 were killed. use a 0.05 significance level to test the claim that seat belts are effective in reducing fatalities. complete parts (a) through (c) below. a. test the claim using a hypothesis test. consider the first sample to be the sample of occupants not wearing seat belts and the second sample to be the sample of occupants wearing seat belts. what are the null and alternative hypotheses for the hypothesis? test?
real- world problem:
jim spends $34.99 on paper and $5.79 on pencils at the store. how much does he spend in all?
the answer is c.