Which purposive sampling technique is used by the researcher to limit the possibility of selectively identifying cases that support the researcher's personal theory?

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Negative-case sampling involves selecting cases that are opposite to the generalizations made about a variable; this sampling technique aims to confirm that the researcher is not selectively finding cases to support a personal theory. Critical-case sampling, in contrast, entails the researcher's selection of cases considered very important in relation to the variable being studied. With extreme case sampling, the researcher chooses cases that represent extremes on a specific variable. Typical-case sampling involves the researcher's selection of cases that seem to be average for the variable studied.

Which Purposive Sampling Technique Is Used by the Researcher to Limit