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Representativt urval

Man brukar säga att urval ska vara representativa. Vad som menas med detta är att urvalet ska ha samma sammansättning som populationen. Gör den inte det kan man få missvisande resultat. Man kan aldrig veta om ett urval är representativt men det finns olika urvalsmetoder för att komma så nära ett representativt urval som möjligt man kan t.ex. göra ett stratifierat urval.

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