Im having difficulty in trying to compute the Covariance Matrix. I think Im missing out an equation to be honest. Here's what I've been given in the question:
Model: Y = theta_0 + X*theta_1 + (X^2)*theta_2 + epsilon
Y | 4, 3, 2, 3, 8
X |-2,-1,0, 1, 2
Now the question asks to...