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.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.