6. At a recent UM football game, a terrorist group flew a crop duster over the s
ID: 3473677 • Letter: 6
Question
6. At a recent UM football game, a terrorist group flew a crop duster over the stadium and dusted the western side of the stands with anthrax spores. Fortunately, the wind was blowing toward the west. Once cases were discovered, the investigation began. A total of 100 people who sat on the eastern side developed disease and 1000 people who sat on the western side developed disease. Of the 100,000 people in attendance, 50,000 were sitting on the western side of the stadium and were considered to have been exposed. (Source: http://practice.sph.umich.edu/micphp/epicentral/odds_ratio.php ). Calculate the odds ratio and interpret your results.
Explanation / Answer
Number of people who developed disease on eastern side=100
Number of people who developed disease on western side=1000
Total number of people attended=100000
People exposed on western side=50000
According to the provided information the odd ratios would be:
(1000)(49,900)/(49,000)(100)
That means the ratio of 1000 people sat on western side is 49,900 and the ratio of 100 people sat on eastern side is 49,000.
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