X13 11 37 60 90 67 65 87 13 6 25 8 11 Y4.75-0.75 31.75 40-5.5-10.75-7.25-1.75 36.75 16.5 79.75 69 9.25
a) Find the covariance and correlation of X and Y. Show all your manual calculations. (15 pts)
b) If we subtract 5 from each values of X, what happens to the answers in (a). Explain in detail. (5 pts)
c) If we divide X by 10, what happens to the answers in (a). Explain in detail. (5 pts)