Exam chapter 9

Exam chapter 9 - Exam 4(Chapter 9 Name 1 Seat Belts and...

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Exam # 4 (Chapter 9) Name___________________________________ 1. Seat Belts and Hospital Times. 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, 50 were injured severely. Among 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). The researchers claim that the rate of severe injuries is lower for children wearing seat belts. a) State the null hypothesis and alternative hypothesis. b) Compute the test statistic. c) Is there sufficient sample evidence to conclude, at the 0.05 significance level, that the rate of severe injuries is lower for children wearing seat belts? d) Calculate the p-value. e) State a conclusion about the null hypothesis and state a final conclusion that addresses the original claim. 2.
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This note was uploaded on 02/01/2011 for the course COMM 130 taught by Professor Watson-currie during the Spring '08 term at CSU Long Beach.

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Exam chapter 9 - Exam 4(Chapter 9 Name 1 Seat Belts and...

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