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Definition of Experimental study

Experimental study Definition from Medicine Dictionaries & Glossaries
Glossary of Epidemiology Terms
A study in which the investigator specifies the exposure category for each individual (clinical trial) or community (community trial), then follows the individuals or community to detect the effects of the exposure.
Experimental study Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
An experiment is an orderly procedure carried out with the goal of verifying, refuting, or establishing the validity of a hypothesis. Controlled experiments provide insight into cause-and-effect by demonstrating what outcome occurs when a particular factor is manipulated. Controlled experiments vary greatly in their goal and scale, but always rely on repeatable procedure and logical analysis of the results. There also exist  natural experimental studies.

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