Explain logic behind using sum of products of deviation

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What is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient? Is this logic sound? Why or why not?

Reference no: EM13142568

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Explain logic behind using sum of products of deviation : What is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient? Is this logic sound? Why or why not?
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