Anumerical measure of linear association between two variables is the a. variance b. coefficient of variation c. correlation coefficient d. standard deviation

A numerical measure of linear association between two variables is the covariance

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A numerical measure of linear association between two variables is the covariance

Covariance is a measure of how changes in one variable are associated with changes in a second variable. Specifically, covariance measures the degree to which two variables are linearly associated. However, it is also often used informally as a general measure of how monotonically related two variables are.  It is similar to variance, but where variance tells you how a single variable varies, covariance tells you how two variables vary together

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