MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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 accompanying table. Using a .01 significance level, test the claim that injuries are independent of helmet color.
| Black helmet |
white helmet |
Yellow helmet |
Red helmet |
Blue helmet |
|
|
Not injured |
472 | 362 | 35 | 161 | 69 |
| Injured | 195 | 105 | 9 | 69 | 33 |
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