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Valor de p e intervalo de confianza al 95% correspondientes a un contraste de medias con N = 20 y desviación estándar en torno a 14, en cada brazo, y efecto real en torno a 7.
| N | Media | Desviación | |
|---|---|---|---|
| Placebo | 20 | 50 | 10 |
|
| |||
| Fármaco F | 20 | 63 | 11 |
Efecto muestral: 13 (6,3, 19,7), p = 0,0004
