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### 12 Cards in this Set

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 probability sampling a random method of selection in which the researcher knows the probability of selection from a population purposeful sampling an intentional method of selection in which the researcher selects particular individuals because they will be especially informative simple random sampling each member of the sampling has the same probability of being selected systematic sampling every nth member of the population is selected stratified sampling population is divided into subgroups, then subjects are selected from subgroups using simple random or systematic procedures proportional stratified sampling number of subjects in each strata reflects proportion in population disproportional stratified sampling number of subjects in each strata does not reflect proportion in population cluster sampling random selection of naturally occuring groups (universities, schools, classrooms, city blocks, households) nonprobability sampling probability of selection unknown convenience sampling a group of subjects selected based on availability quota sampling nonrandom sampling representative of a target population maximum variation sampling subjects are selected from both ends of a continuum to represent extreme cases