The Average of the Cross-Products of Z Scores Is a Better

Multiple Choice

The average of the cross-products of Z scores is a better indicator of the relationship between two variables than the sum of the cross-products of Z scores because the average

A) appropriately measures the strength of the relationship whereas the sum does not.
B) appropriately measures the direction of the relationship whereas the sum does not.
C) is converted to a standard scale from -10 to +10 whereas the sum is not.
D) is formed using a combination of the two variables' measurement scales whereas the sum is not.