highly significantP value <.005
The linear effect ( X 1 ) and the squared effect ( X 1 2 ) were significant ( P value <.05), and the interactive effect ( X 1 X 2 ) was highly significant ( P value <.005).
The linear effect ( X 1 ) and the squared effect ( X 1 2 ) were significant ( P value <.05), and the interactive effect ( X 1 X 2 ) was highly significant ( P value <.005).