Sample variance estimates at the 95% confidence interval
| Sample size (n) | ||||
|---|---|---|---|---|
| Percentage result | 500 | 700 | 1000 | 1500 |
| 10% | 2.6% | 2.2% | 1.9% | 1.5% |
| 20% | 3.5% | 3.0% | 2.5% | 2.0% |
| 30% | 4.0% | 3.4% | 2.8% | 2.3% |
| 40% | 4.3% | 3.6% | 3.0% | 2.5% |
| 50% | 4.4% | 3.7% | 3.1% | 2.5% |
| 60% | 4.3% | 3.6% | 3.0% | 2.5% |
| 70% | 4.0% | 3.4% | 2.8% | 2.3% |
| 80% | 3.5% | 3.0% | 2.5% | 2.0% |
| 90% | 2.6% | 2.2% | 1.9% | 1.5% |