Julian conducted a study investigating the impact of a 10-minute daily meditation app on stress levels in a small sample of 15 university students. He recruited participants using volunteer sampling via a post on a social media group, and measured stress levels using a self-report questionnaire. Explain one improvement Julian could make to his study.
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.