Which value of correlation coefficient (r) suggests strongest correlation amongst the following ?
r = −1
Karl Pearson’s correlation coefficient lies between −1 and +1. Its sign shows the direction of the relationship and its absolute value \(|r|\) shows the strength.
Comparing absolute values: \(|0| = 0\) (no linear correlation), \(|0.25| = 0.25\) (weak), \(|0.75| = 0.75\) (fairly strong) and \(|-1| = 1\), which is perfect (negative) correlation.
Hence, the answer is r = −1.
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