In a study of 100 people with panic disorder,50 were treated with psychotherapy and 50 were treated with medication.At the end of 12 weeks of treatment,the psychotherapy group had an average score of 25 on a scale of panic severity,while the medication group had an average score of 75.This difference is called the

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The difference in average scores between the psychotherapy group and the medication group is an experimental effect, as it shows the impact of the different treatments on the outcome variable (panic severity). The other options (within-groups variance and internal validity) do not adequately describe this difference.

In a Study of 100 People with Panic Disorder,50 Were