A psychologist compares two layouts for a self-service ticket machine. Each of 20 adults is asked to buy the same set of three tickets on a simulator. Every adult uses the list layout first and, after a short break, uses the map layout. The psychologist records the number of seconds taken to complete each booking.
State the experimental design used in this study.
Explain one problem this design creates when the psychologist compares the booking times.
182 exam-style questions on OCR GCSE Psychology 7.1 Planning Research, covering 7.1.1 Hypotheses, 7.1.2 Variables, 7.1.3 Experimental Designs, 7.1.4 Populations and Sampling, 7.1.5 Ethical issues, and 7.1.6 Dealing with ethical issues and BPS Code. Each one has a worked solution and a mark scheme showing where the marks go.