Error Associated with Samples of Given Sizes*
| Size of Sample | Error Associated with Percentage Estimates |
| 100 | +/- 10% |
| 150 | +/- 8% |
| 200 | +/- 7% |
| 250 | +/- 6% |
| 300 | +/- 6% |
| 350 | +/- 5% |
| 400 | +/- 5% |
| 450 | +/- 5% |
| 500 | +/- 4% |
| 600 | +/- 4% |
| 700 | +/- 4% |
| 800 | +/- 4% |
| 900 | +/- 3% |
| 1000 | +/- 3% |
| 1100 | +/- 3% |
| 1200 | +/- 3% |
| *Presumes the individuals selected were selected by chance by the researcher. The estimates do not include error attributable to measurement or other survey errors. |