Which of the following statements about sampling is true?
A) Convenience sampling is used by both qualitative and quantitative researchers.
B) Quantitative researchers establish eligibility criteria, but qualitative researchers do not.
C) Extreme case sampling is a type of theoretical sampling.
D) Focus groups would not be used in qualitative descriptive studies.
A
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Convenience sampling is used by both qualitative and quantitative researchers. Sampling by convenience is efficient, but is not a preferred approach, even in qualitative studies. Like quantitative researchers, qualitative researchers often identify eligibility criteria for their studies. Although they do not specify an explicit population to whom results could be generalized, they do establish the kinds of people who are eligible to participate in their research. Qualitative researchers may start with convenience or snowball sampling, but usually rely eventually on purposive sampling to guide them in selecting data sources that maximize information richness. One type of purposive sampling (not theoretical sampling) is extreme case sampling (selecting the most unusual or extreme cases). Focus groups have been used by researchers in many qualitative traditions and in qualitative descriptive research.
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