![]() ![]() External validity Whether results of the study can be generalized to other situations and other people. ![]() Confounding factors often impact the internal validity of an experiment. Internal validity extent to which a causal conclusion based on a study is warranted. ![]() Clinical trials highly controlled interventional studies Randomized controlled trial people studied randomly given one of treatments under study, used to test efficacy/side effects of medical interventions like drugs. comparing people with the disease with those who don't but are otherwise similar. Case-control study observational study where 2 groups differing in outcome are identified and compared to find a causal factor. ![]()
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