An educational psychologist computes Pearson's r r\,r to examine the relationship between the time spent using a revision app (in hours) and the score achieved in an end-of-topic assessment. Which of the following calculated values for the correlation coefficient (rrr) is mathematically impossible?
+0.94+0.94+0.94
−0.08-0.08−0.08
+1.12+1.12+1.12
−0.95-0.95−0.95
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.