For the following set of scores, X Y 4 5 6 5 3 2 9 4 6 5 2 3

a. Compute the Pearson correlation.

b. Add 2 points to each X value and compute the correlation for the modified scores. How does adding a constant to every score affect the value of the correlation?

c. Multiply each of the original X values by 2 and compute the correlation for the modified scores.
How does multiplying each score by a constant affect the value of the correlation?