In Exercises 518, test the given claim. Injuries and

Chapter 11, Problem 16

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In Exercises 518, test the given claim. Injuries and Motorcycle Helmet Color A case-control (or retrospective) study wasconducted to investigate a relationship between the colors of helmets worn by motorcycledrivers and whether they are injured or killed in a crash. Results are given in the table below(based on data from Motorcycle Rider Conspicuity and Crash Related Injury: Case-ControlStudy, by Wells et al., BMJ USA, Vol. 4). Test the claim that injuries are independent ofhelmet color. Should motorcycle drivers choose helmets with a particular color? If so, whichcolor appears best?Color of HelmetBlack White Yellow>Orange Red BlueControls (not injured) 491 377 31 170 55Cases (injured or killed) 213 112 8 70 26

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