A psychologist compares how many correct matches Year 10 pupils make in three minutes when completing a 25-item symbol-matching sheet printed in black ink with how many they make when it is printed in blue ink. Pupils complete the black-ink condition at desks with chairs and the blue-ink condition on hard stools in the school hall.
Explain one way the arrangements for carrying out the two conditions might have affected the results, and how the psychologist could make those arrangements consistent.
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.