Dr Vance conducted an investigation into the effectiveness of a new mindfulness-based mobile application designed to reduce occupational stress among corporate employees. He recruited a sample of 15 volunteer participants from a single tech startup in London. To assess stress reduction over a 4-week period, Dr Vance relied on the participants' retrospective weekly self-reports of their stress levels.
Explain one improvement that Dr Vance could make to his investigation.
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.