Table 1 Sample size calculation using G*Power3
Analysis: | A priori: compute required sample size | ||
|---|---|---|---|
Input: | Effect size f | = | 0.25 |
|  | α err prob | = | 0.05 |
|  | Power (1-β err prob) | = | 0.8 |
| Â | Numerator df | = | 3 |
| Â | Number of groups | = | 4 |
Output: | Noncentrality parameter λ | = | 11.1875000 |
| Â | Critical F | = | 2.6562339 |
| Â | Denominator df | = | 175 |
| Â | Total sample size | = | 179 |
| Â | Actual power | = | 0.8015073 |