Nonprobability sampling methods include convenience sampling, quota sampling and purposive sampling.
2.
In quota sampling the selection of the sample is non-random.
3.
In quota sampling, there is non-random sample selection and this can be biased because not everyone gets a chance of selection.
4.
In the 1930s most pollsters used quota sampling, in which interviewers are asked to find and question certain numbers of people who match various profiles.
5.
In 1948, they used quota sampling, where interviewers were told to find so many young white men, so many elderly black women, and so on.
6.
Stratification is used in quota sampling, a non-random method in which the researcher identifies strata of the population and pre-determines how many participants are needed from each strata.
7.
That same year, George Gallup, an advertising executive who had begun a scientific poll, predicted that Roosevelt would win the election, based on a quota sample of 50, 000 people.
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