8 If you know the correlation coefficient between two variables (X and Y), how can you determine the direction of causality? a) sources You can determine the direction of causality from the correlation being positive or negative . b) You can determine the direction of causality by calculating how much statistical power there is . c) You cannot determine the direction of causality from the correlation coefficient . d) None of the above. Question 9 Which of the following is a true statement? a) Resources Using Z scores allows you to compare scores on different measures . b) The sum of the cross-products of Z scores gives you a small positive number if there is a positive correlation and a small negativ negative correlation . c) Because of the nature of Z scores, the cross-products will be positive in all cases . d) Z scores don't give a standard indication of just how high or low each score is