A researcher runs an experiment to compare the effectiveness of two different coping-strategy workshops (Workshop A and Workshop B) for reducing anxiety in university students. The researcher uses a matched-pairs design where students are matched on their initial anxiety test scores.
Identify one other variable for which the researcher could have matched the students. Explain how this might have affected the change in anxiety levels if it was not controlled.
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.