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A psychiatrist tells you that she is interested in determining if the condition of individuals who are clinically depressed improves with either 20 or 40 milligrams of Prozac. She decides to administer 20 milligrams to a random half of her clients, and 40 milligrams to the other half. She finds that after 6 months the clients who took 40 milligrams are significantly less depressed then those clients who took 20 milligrams of Prozac. Which type of research didi the psychiatrist conduct?

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Answer:

If a psychiatrist conducts a research in which she administers two different dosages of the same drug to two different groups of patients, she is conducting a clinical trial.

Explanation:

Clinical trials are medical research studies that evaluate the results of new medical advances in a group of people. In this case, the doctor is comparing the treatments' results in both groups of patients.

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