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| specifies in advance how participants are to be selected and how many to include |
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| the entire aggregation of cases in which a researcher is interested |
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| specific characteristics that researchers use to delimit the study population |
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| the entire population in which a researcher is interested |
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| composed of cases from the target population that are accessible to the researcher as study participants |
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| the process of selecting a portion of the population to represent the entire population |
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| a subset of population elements |
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| one whose main characteristics closely approximate those of the population |
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| the systematic overrepresentation or underrepresentation of some segment of the population in terms of a characteristic relevant to the research question |
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| subpopulations (found in populations) |
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| researchers select elements by nonrandom methods |
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| entails using the most conveniently available poeple as participants |
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| a variant of convenience sampling; early sample members are asked to refer other people who meet the eligibility criteria |
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| researchers identify population strata and determine how many participants are needed from each stratum |
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| involves recruiting all of the people from an accessible population who meet the eligibility criteria over a specific time interval, or for a specific sample size |
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| based on the belief that researchers' knowledge about the population can be used to hand-pick sample members |
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| involves the random selection of elements from a population |
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| process in which each element in the population has an equal, independent chance of being selected |
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| the technical name for the list of the population elements |
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| Statified random sampling |
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Definition
| aim is to enhance representiveness; the population is first divided into two or more strata |
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| successive random sampling of units |
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