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1 These are: random samples. quota samples.
2 The major defence pollsters give is that quota samples generally predict the outcome of elections pretty well.
3 Quota sampling is like stratified sampling, but with an important variation.
4 Quota sampling is widely used in market research as it is cost-effective.
5 Opinion polls in Britain are almost always conducted on quota samples.
6 Among the inheritance of this type of survey are procedures known as the quota sample and the attitude questionnaire.
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