PART A

Public Safety: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 123 children using seat belts, 16 were injured severely.Is there sufficient sample evidence to conclude that the rate of severe injuries is lower for children wearing seat belts? (from "Morbidity Among Pediatric Motor Vehicle Crash Victims:The Effectiveness of Seat Belts," by Osberg and Di Scala, American Journal of Public Health)

PART B

A statistics student claimed that an individual's arm span is equal to the individual's height.To test this claim, the student used a random sample of 10 students and obtained the following data.Test the claim with an a = 0.01.