Why must the scores for each variable be changed into deviation scores in the first step of determining ...

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Why must the scores for each variable be changed into deviation scores in the first step of determining the correlation coefficient? Explain your answer.

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    We know that correlation coefficient is a measure of the degree of relationship or association between two random variables x and y, and is supposed to show how much each is affected by the other ...
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      Whymustthescoresforeachvariablebechangedintodeviationscoresinthefirststepofdeterminingthecorrelationcoefficient.doc