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In: Statistics and Probability

A​ case-control (or​ retrospective) study was conducted to investigate a relationship between the colors of helmets...

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 accompanying table. Using a 0.01 significance​ level, test the claim that injuries are independent of helmet color.

Color of Helmet

Black

White

Yellow

Red

Blue

Controls​ (not injured)

479

351

29

169

90

Cases​ (injured or​killed)

203

114

8

71

42

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orchestra answered 1 year ago
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