r measures the strength of a linear relationship. CAPS Grade 12 definition, worked NSC example and related statistics practice.
r measures the strength of a linear relationship.
The correlation coefficient r lies between −1 and 1. Values near ±1 indicate a strong linear relationship, values near 0 indicate almost none, and the sign shows the direction.
r = −0,92 indicates a strong negative linear relationship.
Hours studied against marks gives r = 0,87: a strong positive linear relationship, so more hours tend to go with higher marks. It does not prove that the extra hours caused the higher marks.
Paper 2 asks for r from a calculator and a description of the strength and direction of the relationship.
Calling a strong negative correlation weak because the number is negative.
The correlation coefficient r lies between −1 and 1. Values near ±1 indicate a strong linear relationship, values near 0 indicate almost none, and the sign shows the direction.
Correlation coefficient belongs to the Statistics section of CAPS Grade 12 Mathematics, which is examined in Paper 2.
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