Dr. Meade conducted an experiment to investigate the effect of a nudge campaign (using posters with health-warning labels) on healthier snack choices in a corporate cafeteria. She recorded the number of healthy snacks purchased over a one-week period while the posters were displayed. She did not measure purchases before the posters were introduced, and there was no control group.
Explain one improvement Dr. Meade could make to the design of her study.
57 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.