One-factor-at-a-time test matrix

[yecko]

Homework Statement

If Z(X,Y) = (X^2+Y^2)*(P(X) + Q(Y)), how to convert it to one-factor-at-a-time test matrix ? Write down the relevant formula and give a brief explanation.

Homework Equations

below: in my attempt

The Attempt at a Solution

Z(X1,X4)
=P(X1)*Q(X4)
=P(X1)*Q(X3)/Q(X3)*P(X3)/P(X3)*Q(X4)
=[P(X1)*Q(X3)]*[P(X3)*Q(X4)]/[P(X3)*Q(X3)]
=Z(X1,X3)*Z(X3,X4)/Z(X3,X3)

Z(X1,X4)
=Z(X1,X3)+Z(X3,X4)-Z(X3,X3)

But I have no idea how to deal with the question... anyone help me please??
thank you

 

[BvU]

Did you google the concept ?

If X and Y are your independent variables and Z is measured, why not just vary x and y ?

I cannot even read your attempt: can't for the life of me understand the = signs

 

[hihi123]

because he is copying directly... Its not even his attempt