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    Injuries and Motorcycle Helmet Color

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    A case-control 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?

    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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    Solution Preview

    Hypothesis: Ho: injuries are independent of helmet color vs. Ha: injuries are dependent of helmet color.


    Now we need to create a table for expected frequency. The expected numbers are written in ().

    Color of Helmet
    Black White Yellow/Orange Red ...

    Solution Summary

    The solution discusses injuries and motorcycle helmet color.