Dr. Kenji conducted an investigation to evaluate the efficacy of a virtual reality (VR) graded exposure therapy program ('VirtuFear-Cope') for military veterans diagnosed with Post-Traumatic Stress Disorder (PTSD). He recruited a self-selected sample of 12 veterans from a single specialist clinic and assessed their PTSD symptom severity using a self-report rating scale before and after they completed six weekly VR sessions. His statistical analysis indicated a significant reduction in PTSD symptoms.
Explain one improvement Dr. Kenji could make to the design of his investigation.
82 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.