model y₁ = a₁ +a₁x, +e, given that Σx₁ = 100,Σx² 1) Use least squares regression to fit the data (x1,y₁), (×2,2), (× 10 10 ) by the linear 10 10 = 10 200,Σy, = 80 and i-1 i-1 i-l 10 Στην, = 400 2 ? i-1 2) Using Newton's interpolating polynomial of order 2, namely, b₁+b₁(x-x)+b₂(x-x₁)(x-x₁) where x₁ = 0, x₁ = 1 and x₁ = 3 to estimate values of f(x)= 2 1 x +1 ?