Table 3
The effect of sample size and difference on the p value when comparing two groups (assuming a constant standard deviation) 7 *
| Sample size of each group | Difference (in units) | p Value |
|---|---|---|
| *Adapted from a theoretical study by Norman et al where they compared the difference between the IQ in the normal population and those reading their statistic book. | ||
| 4 | 10.0 | 0.05 |
| 25 | 4.0 | 0.05 |
| 400 | 1.0 | 0.05 |
| 2500 | 0.4 | 0.05 |
| 10 000 | 0.2 | 0.05 |
