A psychologist records how many hours each pupil slept last night and their score on a maths test out of 20, to see whether the two are related.
Which statement correctly describes the variables in this study?
Hours of sleep and maths score are co-variables, and neither is manipulated.
Hours of sleep is the independent variable and maths score is the dependent variable.
Hours of sleep is an extraneous variable that has to be controlled.
Maths score is the independent variable because the researcher sets the test.
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.