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| Concentration (μg/g) | Actual mortality (%) | Expected mortality (%) | χ2 |
|---|---|---|---|
| 1 | 6.3 | 10.4 | 1.77 |
| 5 | 15.6 | 14.1 | 0.20 |
| 10 | 25.0 | 21.9 | 0.56 |
| 50 | 64.6 | 55.7 | 3.07 |
| 100 | 89.6 | 58.4 | 38.53 |
| ∑χ2 | 44.13 |
