A study was made of 413 children who were hospitalized as a result of motor vehicle crashes. Among 290 children who were not using seat belts, 60 were injured severely. Among 123 children using seat belts, 16 were injured severely (based on data from "Morbidity Among Pediatric Motor Vehicle Crash Victims: The Effectiveness of Seat Belts," by Osberg and Di Scala, American Journal of Public Health, Vol. 82, No. 3). For this problem we want to know, is there sufficient sample evidence to conclude, at the 0.05 significance level, that the proportion of severe injuries is higher for children not wearing seat belts? Let pi be the proportion of severe injuries among all children not wearing seatbelts and who were involved in crashes. Let p2 be the proportion of severe injuries among all children wearing seatbelts and who were involved in crashes. Which is the proper expression of Ho? O Pi = P2 O Pi < P2 O pi > P2 Which is the proper expression of H1? O Pi < P2 O Pi = P2 O Pi > P2 Calculate p, to 4 decimal places: Calculate p, to 4 decimal places: Calculate the pooled sample estimate: p = Calculate the pooled sample estimate: q = For this test Zcritical (to 4 decimal places) For this test ztest = (to 4 decimal places) Determine the p-value, correct to 4 decimal places: Conclusion: O Do not reject Ho

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.