1.       The model Y_i=a +b₁X_1i +b₂X_2i +b₃X_3i +U_iis to be estimated from a sample of 20 observations. Using the information below obtain the OLS estimate of the parameters of the above model.

 (x/x)^-1 _{=0.1, -0.12, -0.03 ( -0.12 -0.03, 0.04 0.02, 0.02 0.08) xy=(10,000, 20,300, 10100, 30200)}

∑_{X1 =400,} ∑_{X2= 200 and} ∑_{X3= 600}

Where x=x_{i -} x_{i, and} y₌ y_i-y_i