Researchers are attempting to assess if cognitive behavioural 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 is an example of a(n):

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This is an outcome study because it assesses the effectiveness of a treatment (CBT) by comparing the depression levels before and after the intervention in the treatment and control groups.

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