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— An investigation using specified methods to answer a research question; e.g. about the effects of treatments


evaluation, test, test of treatments, treatment comparison, treatment test, trial

Full explanation:

Research requires that studies address questions to which we don’t know the answer. Depending on the nature of the research questions, different study designs will be appropriate.

Different types of studies can be used to evaluate treatment effects, including randomized studies  and non-randomized studies.

See also:

experimental study  ·  fair tests of treatments  ·  non-randomized study  ·  research methods

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