If you had 5,000 dogs in your study, then you’d start to see that there were German Shepherds and Dobermanns and beagles, and that these different breeds have different features.
Si tuviéramos 5000 perros en el estudio, entonces empezaríamos a ver que había pastores alemanes, dóberman y beagles, y veríamos que cada raza tiene rasgos distintos.