MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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 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.|
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Color of Helmet
|
|
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||||
|---|---|---|---|---|---|---|---|---|
|
|
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Black
|
White
|
Yellow
|
Red
|
Blue
|
|
|
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Controls (not injured)
|
|
496
|
366
|
27
|
156
|
84
|
|
|
|
Cases (injured or killed)
|
|
212
|
113
|
6
|
66
|
40
|
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