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experimental study
1) A study based upon experiment rather that a review of existing information.
2) Randomized controlled trial or randomized clinical trial. An experiment that uses random assignment to create treatment & control groups so that changes can be inferred or attributed to the experimental treatment.
Related
meta-analysis
observational study
prospective cohort study; prospective study
quasi-experimental study
retrospective study
Specific
clinical trial
General
scientific investigation