Paper 2 · November 2018 · Correlation and Regression
For a data set with D: 0, 5, 10, 15, 20, 25, 30, 35 and corresponding M: 90, 82, 56, 68, 58, 46, 30, 20, the product moment correlation coefficient works out to r is approximately -0.957. Which statement best describes this correlation?
ANo meaningful correlation between D and M.
BStrong positive correlation between D and M.
CStrong negative correlation between D and M.
DWeak negative correlation between D and M.
Explanation
An r value close to -1 (here about -0.957) indicates a strong negative linear relationship: as D increases, M tends to decrease.
Derived from ZIMSEC Statistics Paper 2, November 2018, Q7