If y = 2 + 3x1 + 5x2 8x3, (a) ryx3 < 0. (b) ryx3x1 <

If ˆy = 2 + 3x1 + 5x2 − 8x3,

(a) ryx3 < 0.

(b) ryx3·x1 < 0.

(c) ryx3·x1,x2 < 0.

(d) Insufficient information to answer.

(e) Answers (a), (b), and

(c) are all correct.