A-level · Data presentation

Correlation and regressionExam-style questions

Bivariate data and scatter diagrams; describing correlation by its direction (positive/negative) and strength; why correlation does not imply causation; and using a given regression line y = a + bx to make and interpret predictions — including why prediction inside the data range (interpolation) is safe but outside it (extrapolation) is not. Interpreting the PMCC is flagged as A-level.

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12 questions · A-level level · mark scheme and worked solution on each · no sign-up to try

DifficultyAll Level 2 Level 3 Level 4 Level 5

1
The product moment correlation coefficient between two variables $x$ and $y$ is $r = -0.91$ . Describe the correlation.
Level 3 · 2 marksTry it
2
The product moment correlation coefficient between two variables is $r = 0.05$ . A student concludes there is no relationship between them. Comment on this conclusion.
Level 3 · 2 marksTry it