This research question is best studied with a true experiment. A true experiment involves randomly assigning participants to either the control group or the experimental group, and then measuring the outcomes of those assigned to each group.
This ensures that any differences in outcomes can be attributed to the intervention, rather than to other factors. With a true experiment, the therapist can be sure that any differences in outcomes are due to the therapy, as opposed to other factors such as the clinic or participant characteristics. A quasi-experimental design is a form of research that does not involve random assignment of participants to the control or experimental group. As such, the results of a quasi-experimental design cannot be attributed to the intervention, as there is no guarantee that any differences in outcomes are due to the intervention and not to other factors.
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