Question: Acase-control (orretrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed

Acase-control (orretrospective) 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 accompanying table. Using a 0.01 significancelevel, test the claim that injuries are independent of helmet color.

Acase-control (orretrospective) study was conducted to investigate a relationship between the colors

Color of Helmet Black White Yellow Red Blue Controls (not injured) 474 348 29 163 75 Cases (injured or 211 1 14 8 67 36 killed)

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