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 six months,the clients who took 40 milligrams of Prozac are significantly less depressed than those clients who took 20 milligrams of Prozac.Which type of study did the psychiatrist conduct?

Question

Quizplus · Accepted Answer

The psychiatrist conducted an experimental research study, as she manipulated the independent variable (dose of Prozac) and measured the resulting effect on the dependent variable (level of depression). By randomly assigning participants to either the 20mg or 40mg dosage groups, she also attempted to control for extraneous variables that could have influenced the results.

A Psychiatrist Tells You That She Is Interested in Determining