Dr. Aris carried out a study to test the effectiveness of a new cognitive behavioural intervention for alcohol addiction using one participant who was classified as a heavy drinker.
She compared the participant's weekly alcohol consumption before they underwent the intervention with their weekly consumption after the intervention.
Identify the experimental design Dr. Aris used in this study.
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.