treatment experiment retrospective study experimental units observational study Definitions a. experimental conditions imposed on the subjects b. a study in which data from the past is examined C. a...

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