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My example is this: I have been approached by a pharmaceutical company that has developed a new drug, which is supposed to be effective in the treatment of schizophrenia. Before I begin mass-producing the drug, the company wants to be sure that the new drug is more effective than the one they are currently producing. The company has hired me to design a research study to determine the effectiveness of the new drug, in comparison to the old one.

My question is: what type of research design would I use for this study and why? How would I determine the effectiveness of one drug over the other?

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