# Sol2 - Solutions to STAT 426 HW2 2.8 Let p1 be the estimated probability that people who suffer fatal injuries in car accident without wearing

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Solutions to STAT 426 HW2. 2.8 Let p 1 be the estimated probability that people who suﬀer fatal injuries in car accident without wearing their seat belts, and p 2 be the estimated proba- bility that people who suﬀer fatal injuries in car accident with wearing their seat belts. p 1 = 1601 1601+162527 = 0 . 009755 ,p 2 = 510 510+412368 = 0 . 001235 The diﬀerence of proportions = p 1 - p 2 = 0 . 009755 - 0 . 001235 = 0 . 00852. The sample probability that people who suﬀer fatal injuries in car accident without wearing their seat belts is 0.00852 higher than the sample probabil- ity that people who suﬀer fatal injuries in car accident with wearing their seat belts. The relative risk p 1 p 2 = 0 . 009755 0 . 001235 = 7 . 90 The sample probability that people who suﬀer fatal injuries in car accident without wearing their seat belts is 7.9 times the sample probability that peo- ple who suﬀer fatal injuries in car accident with wearing their seat belts. The odds ratio =

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## This note was uploaded on 04/29/2010 for the course STAT stat 426 taught by Professor Xe during the Spring '10 term at University of Illinois at Urbana–Champaign.

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Sol2 - Solutions to STAT 426 HW2 2.8 Let p1 be the estimated probability that people who suffer fatal injuries in car accident without wearing

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