Statistical testing is applied to accept or reject a given hypothesis, basing on evidence or data. You can find here (PDF slides) some lecture notes about that issue, as part of the course "Statistics for Business" given by Professor Josemari Sarasola in the Faculty of Business and Economics of the University of the Basque Country in Donostia.
You can also find all the course material here.
See, also
- Gardenki: Proba estatistikoak: sarrera, the same notes in Basque.