A simple random sample of front-seat occupants involved in a car crushes is obtained. Among 2823...

A simple random sample of front-seat occupants involved in a car crushes is obtained. Among 2823 occupants not wearing seat belts, 31 were killed. Among 7765 occupants wearing seat belts, 16 were killed. We want to use 0.05 significance level to tes the claim that seat bests are effective in reducing fatalities.

a)Test the claim using a hypothesis test.

b) Test the claim by constructing an appropriate confidence interval.

c) What does the result suggest about the effectiveness of seat belts?

Expert Solution

orchestra answered 1 year ago

A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2500 occupants...

A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2500 occupants not wearing seat belts, 15 were killed. Among 7500 occupants wearing seat belts, 15 were killed. Use this data with 0.05 significance level to test the claim that the fatality rate is higher for those not wearing seat belts. (Write all necessary steps like Hypotheses, Test Statistic, P-value & Conclusion) Given that P(z<3.17)=0.9992.

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A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2901 occupants...

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A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2991 occupants not wearing seat belts, 28 were killed. Among 7768 occupants wearing seat belts, 16 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. b. Identify the test statistic c. P-value d. Confidence interval

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A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2989 occupants not wearing seat belts, 29 were killed. Among 7785 occupants wearing seat belts, 12 were killed. Use a 0.05 significance level to test the claim that seat belts are effective in reducing fatalities 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...

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A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2719 occupants not wearing seat belts, 39 were killed. Among 7860 occupants wearing seat belts, 19 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...

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A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2964 occupants not wearing seat belts, 30 were killed. Among 7706 occupants wearing seat belts, 13 were killed. Use a 0.05 significance level to test the claim that seat belts are effective in reducing fatalities. Find the test statistic Z to 3 decimal places, the P-value to 3 decimals, and find the confidence interval.

A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2700 occupants...

A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2700 occupants not wearing seat belts, 34 were killed. Among 7666 occupants wearing seat belts, 14 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. Test the claim using a hypothesis test. Consider the first sample to be the sample of occupants not wearing seat belts and the second...

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A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2758 occupants not wearing seat belts, 30 were killed. Among 7650 occupants wearing seat belts, 12 were killed. Use a 0.05 significance level to test the claim that seat belts are effective in reducing fatalities. 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...

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