How can I find the least-square regression line?

Question

If I was given this data how can I find the least squares regression line:

 

x = 21

 

y= 78

 

sx = 1.5

 

sy= 0.8

 

r=0.81

Answer 1

Vivian,

 

y=a+bx where b=r sx sy.

 

Hope that helps!