All of the following are reasons why Z scores are used to help determine the degree of linear correlation EXCEPT
A) Z scores give a standard indication of just how high or low each score is.
B) the sum of the cross-products of Z scores yields a large positive number if there is a positive correlation and a large negative number if there is a negative correlation.
C) that because of the nature of Z scores, the cross-product will be positive in all cases.
D) using Z scores allows comparison of scores on different measures.
Answer: C
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