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Correlation coefficient (r)
Correlation coefficient measures the degree of association between two variables such as the cost and the activity level.r = nΣxy - Σx Σy [nΣx2 – (Σx)2 ] [nΣy2 - (Σy)2]When the degree of association among the two variables is very close then it would be almost possible to plot the observation on a straight line and r will be almost equal to one.
-1≤ r ≤ 1If r= -1, then the two variables are said to be perfectly negatively correlatedIf r = +1, then the two variables are perfectly positively correlatedIf r = 0, then there is no correlation between the two variables.
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