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What are the differences between open- and closed-class systems?
Representative Sample
A subset of a population that accurately reflects the members of the entire population.
Volunteer Bias
The distortion of research results due to differences between those who choose to participate in studies and those who do not.
Representative Sample
A portion of the population that correctly mirrors the characteristics of the whole population.
Operationally Defined
A term or variable is defined by the specific process or set of criteria by which it is measured or determined in a study or experiment.
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