All of the following are reasons why Z scores are used to help determine the degree of linear correlation EXCEPT:
Z scores give a standard indication of just how high or low each score is
The sum of the cross products of Z scores gives you a large positive number if there is a positive correlation and a large negative number if there is a negative correlation
Because of the nature of Z scores, the cross product will be positive in all cases
Using Z scores allows you to compare scores on different measures

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