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Differentiate between prospective and retrospective studies.
A type of study where researchers impose treatments on the participants or experimental units.
An animal or thing involved in an experiment.
A type of study where researchers can observe the participants, but not affect the behavior or outcomes in any way.
A study that begins by selecting participants, then tracks them and keeps data on the subjects as they go into the future.
A study that observes what happened to the subjects in the past, in an effort to understand how they became the way they are in the present.
The people or things being examined in an observational study.