True or False 4. A formal service quality evaluation process measures the differences between service expectations and performance perceptions. True or False 5. An effective supplier certification mechanism within the company will generally improve the quality, but typically at a higher purchase price. True or false 6. Additive sampling is an approach where every item in the total group has the same possibility of being chosen. True or false 7. A person making Deming's Mistake 1 would treat common cause variation as if it were actually special cause variation