if we know our customers consists of a) 30% women 20-35 b) 50% women 36-50 and c) 20% women 51 - 65 we can select a random sample of numbers from each catagory according to these percentages.
SAMPLING; STRATIFIED
Meaning of SAMPLING; STRATIFIED in English
Raynet Business and Marketing English glossary. Английский глоссарий компании Raynet Business and Marketing . 2012