Question: A 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

A 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. 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? Test the given claim.

Color of Helmet Black WhiteYellow/Orange Red Blue 491 377 31 170 Controls (not injured) 8 70 26 213 112 Cases (injured or killed)

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