Injury experience is studied in an underground coal mine with a random sample of 132 workers. The results of the study are tabulated below.
| Injured | Non-injured | Total workers | |
|---|---|---|---|
| Roof-bolter operators | 13 | 12 | 25 |
| Loader operators | 35 | 72 | 107 |
| Total workers | 48 | 84 | 132 |
The odds ratio of experiencing an injury by the roof-bolter operators when compared to the loader operators is _______ [round off to 2 decimal places]
Min: 2.2 Max: 2.3
Answer: 2.25
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