Test of association between two variables is done by?

Ans is 'a' i.e., X2 This is tricky question. Because all the options X2 (Chi-square test), correlation and Regression are related to `association between two variables'. Chi-square test is the test of association between two variables. It measures the probability of association between two discrete variables, i.e. whether the association between two variables is true or by chance. Strength of association between two variables is determined by correlation and the quantification of this strength is done by regression. So, i) Test for association between two variables -> chi-square test (x2) ii) Strength of this association will be determined by correlation strong positive / negative or weak positive / negative. iii) Quantification is done by regression by regression we might predicts the weight by measuring height.