In a laboratory experiment investigating the impact of ambient room temperature on cognitive focus, researchers recruited 15 retired volunteers from a local community centre to complete a 5-minute mental arithmetic test under either a hot (30∘C30^\circ\text{C}30∘C) or a temperate (20∘C20^\circ\text{C}20∘C) environment. Focus was operationalised as the number of correct additions completed.
Explain two improvements that the researchers could make to this cognitive focus 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.