Question

If the coefficient of correlation between the variables X and Y is r, the coefficient between X2 and Y2 is ____
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Answer 1

Answer:

Divide the sum by sx ∗ sy. Divide the result by n – 1, where n is the number of (x, y) pairs. (It's the same as multiplying by 1 over n – 1.) This gives you the correlation, r.