A research trial investigates the effectiveness of a new wearable acoustic device, 'FocusWave', designed to improve deep concentration levels in stock traders during high-volatility trading hours.
Explain one limitation of asking the stock traders to self-report their concentration levels when using 'FocusWave'.
Practise AQA A Level Psychology Research methods with exam-style questions for A Level Psychology. 100 questions covering Experimental method, Observational techniques, Self-report techniques, Correlations, Content analysis (A-level only), Case studies (A-level only), Scientific processes, Data handling and analysis, and Inferential testing (A-level only), matched to the AQA A Level Psychology (7182) 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.