A psychologist records each adult's resting pulse rate in beats per minute and the number of words they recall from a list of 30. Adults with similar pulse rates obtain both high and low recall scores, and higher pulse rates are not consistently linked with either higher or lower scores. Which conclusion is correct?
Resting pulse rate is the independent variable and the number of words recalled is the dependent variable.
A correlation cannot be found because pulse rate and the number of words recalled use different units.
Resting pulse rate and the number of words recalled show a zero correlation.
Resting pulse rate and the number of words recalled show a positive correlation.
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.