A researcher wanted to investigate the impact of circadian rhythms on short-term memory capacity. Using random sampling, she selected 30 university students and split them into two equal groups of 15.
The researcher found that Group A recalled significantly more words than Group B. However, peer reviewers rejected the manuscript, citing a major flaw in the experimental design.
Explain one problem with the design of this study and suggest how the researcher could address this problem.
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.
