Injuries and Motorcycle Helmet ColorA case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers 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-Control Study,” by Wells, et al., BMJ USA, Vol. 4). Test the claim that injuries are independent of helmet color. Should motorcycle drivers choose helmets with a particular color? If so, which color appears best?
Color of Helmet
Black
White
Yellow /Orange
Red
Blue
Controls (not injured)
491
377
31
170
55
Cases (injured or killed)
213
112
8
70
26
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