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Margin of error for an observed correlation coefficient of zero.
| Sample sizea | Margin of error (95% confidence interval for an observed correlation coefficient of zero) | Minimum observed correlation coefficient at which p < 0.05 |
|---|---|---|
| 2000 | −0.04 to 0.04 | 0.04 |
| 1000 | −0.07 to 0.07 | 0.07 |
| 160 | −0.16 to 0.16 | 0.16 |
| 100 | −0.20 to 0.20 | 0.20 |
| 50 | −0.28 to 0.28 | 0.28 |
For an ecological study of healthcare organisations, this would be the number of organisations and not the number of individuals.
