Suppose that a hospital wants to evaluate whether a new drug works better than the drug it currently uses to treat a certain ailment. The hospital conducts a small experiment to assess the effectiveness of the new drug. To conduct the experiment, the hospital randomly assigns one group of patients to the new drug, which requires patients to drink an entire glass of water when it is taken, and a second group is assigned to the old drug, which does not require drinking.



What is an appropriate method of controlling for any confounding variables?


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