Dr Shah investigates whether pupils are more likely to choose a logic puzzle when it appears first rather than fourth in an activity booklet. As pupils in the first-position condition consider the logic puzzle, Dr Shah smiles and nods. He keeps a neutral expression while pupils in the fourth-position condition make their choice.
Explain how Dr Shah's behaviour during the study could make his findings less valid.
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.