Maya conducted an investigation to evaluate the effectiveness of a online Cognitive Behavioural Therapy (CBT) application for moderate anxiety. She recruited a volunteer sample of 15 outpatients from a single local mental health clinic and asked them to complete a self-report anxiety questionnaire before and after using the application for four weeks. Her results showed a significant decrease in anxiety scores.
Explain one improvement Maya could make to her 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.