A simple random sample offront-seat occupants involved in car crashes is obtained. Among 2803 occupants not wearing seatbelts, 37 were killed. Among 7698 occupants wearing seatbelts, 20 were killed. Use a 0.01 significance level to test the claim that seat belts are effective in reducing fatalities. Complete parts(a) through(c) below. a) Identify the test statistic (round to two decimals) b) What is the conclusion based on the hypothesistest? c) Test the claim by constructing an appropriate confidence interval.

The 90 % confidence interval is