| Sample size | |
| Population size (for finite population correction factor or fpc) ( | 10,000,000 |
| Hypothesized % frequency of outcome factor in the population ( | 6%+/−5 |
| Confidence limits as % of 100 (absolute +/− %) ( | 5% |
| Design effect (for cluster surveys-DEFF) | 1 |
| Sample size (n) for various confidence levels | |
| Confidence level (%) | Sample size |
| 95 | 87 |
| 80 | 38 |
| 90 | 62 |
| 97 | 107 |
| 99 | 150 |
| 99.9 | 245 |
| 99.99 | 342 |
| Equation | |
| Sample size | n = [DEFF × Np (1 − p)] / [(d2 / Z21−α/2 × (N − 1) + p × (1 − p)] |