Write down the equation for method of least square with the Normal equ

1.	Write down the equation for method of least square with the Normal equations.
Answer» The equation is y = a + bx; Normal equations are na + bΣx = Σy; aΣx + bΣx² = Σxy Quadratic/second degree equation/parabolic trend equation is: y = a + bx + cx² : Normal equations are: na + bΣx + cΣx² = Σy; aΣx + bΣx² + cΣ = Σxy ; aΣx² + bΣx³ + cΣx⁴ = Σx²y.

Write down the equation for method of least square with the Normal equations.

Answer»

na + bΣx = Σy;

aΣx + bΣx² = Σxy

y = a + bx + cx² : Normal equations are: na + bΣx + cΣx² = Σy;

aΣx + bΣx² + cΣ = Σxy ; aΣx² + bΣx³ + cΣx⁴ = Σx²y.