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A simple random sample of front-seal occupants involved in car crashes is obtained. Among 2746 occupants no! wearing seat belts, 30 were killed, Among 7631
A simple random sample of front-seal occupants involved in car crashes is obtained. Among 2746 occupants no! wearing seat belts, 30 were killed, Among 7631 occupants wearing seat bolts, 10 were killed. Use a 0.05 significance level to lost the claim that seat belts are effective in reducing fatal Ses. 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 ateralive hypotheses for the hypothesis test?. Q A HOPI =P2 OG. H PI = P2 H PI Pa H, P * P OD. HJ P1 Pa OF Ho PIPPI OF HOP SP2 HitPI PI Identify the test statistic (Round to two decimal places as needed.) klantily the Pivalun. (Round to three decimal places as needed) What is the conclusion based on the hypothesis test? The P.value is the significance level of a =0 05, so the null hypothesis. There sufficient ov denon to support the daim that the fatality rate is higher for those not wearing seat belts. b. Test the claim by constructing an appropriate confidence interval The appropriate confidence interval is ]- (p -P) . (Round to three decimal places as needed.)Identity the P-value. [Round to three decimal places as needed ) What is the conclusion based on the hypothesis test? The P-value in the significance level of a = 0 05, so the null hypothesis. There sufficient evidence to support the claim that the fatality rate is higher for thome not wearing seat belts b. Test the claim by constructing an appropriate confidence Interval The appropriate confidence interval is = (P, -P.) - (Hound to three decimal places as needed.) What is the conclusion based on the confidence Interval? Because the confidence interval limits O. it appears that the two fatality rates are Because the confidence Inlarval timrita include values, it appear that the fatality rain is for those not wearing seal boils; c. What do the results suggest about the effectiveness of seat belts?. O A. The rests suggest that the use of seal bolts is associated with higher fatality rates than not using seat belts OB, The re outs suggest that the use of seat belts is associated with lower fatality rates than not using seat belts. O C. The resurs suggest that the use of seat belts is associated with the same fatality rates as not using seat belts Q D. The results are inconclusive
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