A researcher investigated the link between dietary habits and mood stability. Commuters at a busy urban train station were approached during the morning rush hour and asked to complete a questionnaire containing 8 open-ended questions about their breakfast habits and immediate feelings. The researcher collected responses over a four-week period across several different platforms, sometimes when severe train delays and heavy rain caused high levels of platform overcrowding, and other times when the weather was clear and trains were running smoothly.
Identify and explain two factors that could have affected the reliability of the data collected in this study.
201 exam-style questions on OCR A Level Psychology Planning and conducting research. Each one has a worked solution and a mark scheme showing where the marks go.