:1. A scatter diagram has four points. Three of the points are
(1,0), (2,1), and (3,2). The fourth point is of the form (4,y).
If the correlation coefficient r is equal to 1, then y must be
equal to <p>

a.  1 <p>

b.  2  <p>

c.  3 <p>

d. 4 <p>

e.  none of the above <p>