Read the following information.
A clinic manager says: "Prolonged exposure therapy must work for PTSD, because clinics all over the country use it."
Explain why the manager's statement is not evidence of effectiveness, and what evidence, such as that from Eftekhari's study, would be needed instead.
103 exam-style questions on Oxford AQA IGCSE Psychology 2.3 Mental health, covering 2.3.1 Incidence of mental health problems over time, 2.3.2 Characteristics of mental health, 2.3.3 Cultural variations in beliefs, 2.3.4 Challenges of modern living, 2.3.5 Recognition and social stigma, 2.3.6 Individual effects of mental health problems, 2.3.7 Social effects of mental health problems, 2.3.8 Diagnosing OCD, 2.3.9 Explanations of OCD, 2.3.10 Therapy for OCD, 2.3.11 Kearns's CBT study, 2.3.12 Diagnosing PTSD, 2.3.13 Explanations of PTSD, 2.3.14 Therapy for PTSD, and 2.3.15 Eftekhari's exposure therapy study. Each one has a worked solution and a mark scheme showing where the marks go.