Dr. Aris conducted a laboratory experiment to investigate whether ambient background noise affects the efficiency of working memory. A sample of participants was asked to perform a complex working memory task (the dual n-back task) while exposed to high-intensity white noise (80 dB80\text{ dB}80 dB). The following day, the same participants completed an equivalent dual n-back task in a completely silent environment (0 dB0\text{ dB}0 dB).
Identify the independent variable (IV) in this investigation.
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, 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.
