Of the following three measures which can measure any type of relationship
(i) Karl Pearson’s coefficient of correlation
(ii) Spearman’s rank correlation
(iii) Scatter diagram
Spearman's rank correlation
Explanation: Spearman's rank correlation is the measure which can measure any type of relationship. But, Karl Pearson's coefficient is the most widely used method due to the preciseness of the 'r value.