Chapter 7. The Logic Of Sampling Key Terms. Nonprobability sampling Technique in which samples are selected in a way that is not suggested by probability theory.
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Snowball samplingResearcher collects data on members of the target population that can be located, then asks those individuals to provide the information to locate other members.
Quota samplingUnits are selected into a sample on the basis of prespecified characteristics, so the total sample will have the same distribution of characteristics assumed to exist in the population being studied.
Probability samplingSamples are selected in accord with probability theory, typically involving some random selection mechanism.
RepresentativenessQuality of a sample having the same distribution of characteristics as the population from which it was selected.