Dr. Vance conducted an investigation into the effectiveness of a newly developed mindfulness smartphone application designed to reduce work-related stress in high-anxiety professions. He recruited a sample of 40 financial traders and asked them to use the application for 15 minutes daily over a two-week period. At the end of the two weeks, Dr. Vance administered a self-report stress questionnaire and recorded their stress scores. He did not measure their stress levels prior to using the application, and no control group was used.
Explain one improvement Dr. Vance could make to the design of his study.
57 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.