Dr. Elijah is a clinical psychologist who wants to investigate whether Acceptance and Commitment Therapy (ACT), a non-medical psychological intervention, is effective in reducing symptoms and preventing relapse in individuals diagnosed with Generalized Anxiety Disorder (GAD).
Explain how Dr. Elijah could design and conduct an empirical study to investigate the effectiveness of Acceptance and Commitment Therapy (ACT) as a treatment for Generalized Anxiety Disorder (GAD).