extremely significantp < 0.01
However, the quadratic effect ( X 1 2 , X 2 2 , X 3 2 ) was found to produce extremely significant ( p < 0.01) positive effect on both Y 1 and Y 2 , but X 4 2 was only significant for Y 2 .
However, the quadratic effect ( X 1 2 , X 2 2 , X 3 2 ) was found to produce extremely significant ( p < 0.01) positive effect on both Y 1 and Y 2 , but X 4 2 was only significant for Y 2 .