highly significantp < 0.0001
The quadratic model Y = 1.08 + 0.092× 1 + 0.045× 2 + 0.15× 3 –0.13X 1 X 2 –0.14× 1 2 –0.23× 2 2 –0.20× 3 2 was highly significant ( p < 0.0001) and lacked-of-fit was not ( p = 0.197).
The quadratic model Y = 1.08 + 0.092× 1 + 0.045× 2 + 0.15× 3 –0.13X 1 X 2 –0.14× 1 2 –0.23× 2 2 –0.20× 3 2 was highly significant ( p < 0.0001) and lacked-of-fit was not ( p = 0.197).