[ 2 ] Quota controls are target numbers of interviews set for specific demographic groups within the population, to help achieve a representative sample for the survey.
[ 2 ] Rheolaethau cwota yw niferoedd targed o gyfweliadau ar gyfer grwpiau demograffig penodol o fewn y boblogaeth, er mwyn helpu i sicrhau sampl gynrychioliadol ar gyfer yr arolwg.