An experiment is designed to test whether a new drug can be used to reduce auditory hallucinations in schizophrenics. Schizophrenics who experience auditory hallucinations are randomly assigned to receive either a placebo drug, a very low dosage, a moderate dosage, or a high dosage of the drug. The results of the experiment show that the moderate dosage is the most effective. What is the major problem with this experiment? O There is a possible order effect O There is no control group that receives no drug at all O The participants weren't matched for occurence of auditory hallucinations The study isn't a true experiment

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