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.