Researchers are attempting to assess if cognitive behavioral therapy (CBT)is an effective treatment for depression.Participants with unipolar depression are assessed and then randomly assigned to either a treatment group or a control group.The treatment group receives CBT twice per week for 6 weeks.The control group receives no treatment.At the end of the 6 weeks,the depression levels of both groups are reassessed.This study found that CBT treatment was more effective than no treatment but is limited because it did not control for:

Question

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The study did not control for the placebo effect, which means that participants in the treatment group may have improved simply because they believed they were receiving an effective treatment. This could have skewed the results in favor of CBT. The study did not need to control for natural improvement or preexisting differences among participants because both groups were randomly assigned. Participant gender was not mentioned and was not relevant to the study.

Researchers Are Attempting to Assess If Cognitive Behavioral Therapy (CBT)is