Suppose we have a set of 100 (x, y) points. If we multiply all of the x's by 10, then:
A. The mean and standard deviation of the x's will be 10 times bigger.
B. The slope and intercept of the regression line will be 1/10 of their original values (10 times smaller).
C. The z-scores for both x and y will stay the same.
D. All of the above are true.
E. Only two of the above are true.