The generation of a Regression Equation is justified when we _____________. (Note: There are 4 correct answers).

The generation of a Regression Equation is justified when we _____________. (Note: There are 4 correct answers).
A . Expect the relationship to be Linear between the output and inputs
B . Know that there is a non-linear relationship between output and input(s)
C . Need to understand how to control a process output by controlling the input(s)
D . Experience several process defects and have no other way to fix hem
E . When it is very expensive or too late to measure the output

Answer: A,C,D,E