A researcher wanted to investigate the impact of screen type (e-ink vs. LCD) on cognitive fatigue during prolonged reading. Using random sampling, she selected 40 participants and split them into two equal groups of 20.
The researcher found that Group A showed significantly lower cognitive fatigue than Group B after the 2-hour period. However, peer reviewers rejected the manuscript, citing major flaws 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.