Question

三点(3,10),(7,20),(11,24)的线性回归方程为(　　)

A.=1.75x-5.75              B.=1.75x+5.75

C.=-1.75x+5.75         D.=-1.75x-5.75

Answer 1

B.设回归直线方程为=x+,

=(x₁+x₂+x₃)=7,

=(y₁+y₂+y₃)=18,

则=

==1.75.

=-=18-1.75×7=5.75.

故=1.75x+5.75.