The main effects for a 4 factor 2 level Half fractional factorial design are shown below A – 3.5 B – 2.7 C – 5.2 D – -4.3 What should the Black Belt conclude merely by looking at the main effects?
SELECT THE CORRECT ANSWER
- Effect C is the most significant for the model
- Effect D is the least significant for the model
- Effect A and B can be ignored
- Any conclusion can only be made after looking at the p-values for the effects
ANSWER
Any conclusion can only be made after looking at the p-values for the effects
EXPLANATION
Conclusions on main effects cannot be drawn merely by looking at the effect values. Rejection or acceptance can be done only post looking at the p-values.