The following table is taken from \"Helmet Use and Risk of Head Injuries in Alpi
ID: 3355325 • Letter: T
Question
The following table is taken from "Helmet Use and Risk of Head Injuries in Alpine Skiers and Snowboarders" by Sullheim et. al., Journal of the American Medical Association, Vol. 295, No. 8. It displays the results from 3562 skiers and snowboarders involved in accidents. Use it to answer the following questions. No Head Injury 656 2330 2986 Total 752 2810 3562 Head Injury Wore Helmet Did Not Wear Helmet 480 Total 96 576 a. If one subject is randomly selected from this study, find the probability that person wore a helmet. b. If a subject with a head injury is randomly selected, find the probability that person did not wear a helmet. c. Find the probability that someone who wore a helmet in this study sustained a head injury. d. Find the probability that someone who did not wear a helmet in this study sustained a head injury.Explanation / Answer
a. Prob that person wore a helmet = Total Persons who wore helment / Totol person under observation = 752/3562 =0.21
b. Prob of person didn't wear helmet given he had injury = Person who had injury who didn't wear helmet/ person with injury = 480/576 = 0.83
c. prob of person wearing helmet sustained injury = Persons who wore helment & have head injury /Total people wore helmet = 96/752 = 0.1277
d. prob of person didn't wearing helmet sustained injury = People not wearing helmen & having injury / total people not wearing helmet = 480/2810 = 0.17
As per the Chegg policy and time crunch I have answerd the 1st question with max 4 sub parts. I would like to answer the rest as well but the policy and time is not in favour. If you want the ans for the rest of the questions as well kindly post each seperately. Hope you understand.
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