A psychologist finds that the more hours pupils spend working in part-time jobs each week, the lower their test scores tend to be. Which conclusion is correct?
Working in a part-time job causes pupils' test scores to fall.
There is a negative correlation between hours of part-time work and test scores.
There is a positive correlation, because both variables are measured as numbers.
There is a zero correlation, because neither variable was manipulated by the psychologist.
139 exam-style questions on OCR GCSE Psychology 7.2 Doing Research, covering 7.2.1 Experiments, 7.2.2 Interviews, 7.2.3 Questionnaires (Surveys), 7.2.4 Observations, 7.2.5 Case Studies, and 7.2.6 Correlations. Each one has a worked solution and a mark scheme showing where the marks go.