Number of experiments done by scientists
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Experiments might be categorized according to a number of dimensions, depending upon professional norms and standards in different fields of study. In some disciplines (e.g., psychology or political science ), a 'true experiment' is a method of social research in which there are two kinds of variables .
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An experiment usually tests a hypothesis, which is an expectation about how a particular process or phenomenon works. ... They are used to test theories and hypotheses about how physical processes work under particular conditions (e.g., whether a particular engineering process can produce a desired chemical compound).
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