A cognitive psychologist conducted a lab experiment to investigate the effects of room temperature on memory recall. Participants in Group A recalled a list of 20 words in a hot room (28∘C28^\circ\text{C}28∘C), while participants in Group B recalled the same list in a cool room (18∘C18^\circ\text{C}18∘C). The psychologist used random allocation to assign participants to the groups.
Apart from using random allocation, suggest one way in which the psychologist might have improved this study by controlling for the effects of extraneous variables. Justify your answer.
Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, 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.
