O monstra dintr-o populatie luata la intamplare in care fiecare persoana are sanse egale de afi selectata.
A sample taken from any given population in which each person maintains equal chances of being selected.
O monstra dintr-o populatie luata la intamplare in care fiecare persoana are sanse egale de afi selectata.
A sample taken from any given population in which each person maintains equal chances of being selected.