Question: treatment experiment retrospective study cases or subjects observational study Definitions a a study in which data from the past is examined b experimental conditions imposed


treatment experiment retrospective study cases or subjects observational study Definitions a a study in which data from the past is examined b experimental conditions imposed on the subjects c a study in which a treatment is applied and responses are observed d a study in which data is collected without anything being done to the subjects e The people animals or things on whom experiments are performed
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