Question

Choose the correct alternative for each of the following:
If $3Y–12X_{1}–9X_{2}=90$ is the equation of the regression plane of Y on $X_{1} and X_{2} then by X_{2}. X_{1}$ is equal to
A) -3
B) 3
C) 30
D) -10

Answer 1

sry sry sry

but I need to answer because I need points for knowing that answer