Marcus wants to investigate whether background music can improve reading concentration among Year 10 students in his school. He plans to play a specific classical playlist during their weekly independent reading sessions.
Explain two ways that Marcus could make sure his investigation is scientific.
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.