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.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.