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When running a research concerning a medicine lowering a blood pressure, a researcher divided 300 patients in three groups. In the first patients got a

When running a research concerning a medicine lowering a blood pressure, a researcher divided 300 patients in three groups. In the first patients got a dose of 40mg, in the second -20 mg, in the third - a placebo. Is this study an observation, or experiment, or comparative experiment?

observation

comparative experiment

experiment

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