Which of the following is true regarding systematic study? a) it attributes causes and effects based on intuition. b) it involves supporting decisions based on gut feelings. c) it analyzes relationships based on previous experiences. d) it involves analyzing relationships based on scientific data. e) it involves taking action based on instinct.

Statistical process control charts: a. indicate to the operator the true quality of material leaving the process. b. display upper and lower limits for process variables or attributes and signal when a process is no longer in control. c. indicate to the process operator the average outgoing quality of each lot. d. display the measurements on every item being produced. e. are a graphic way of classifying problems by their level of importance, often referred to as the 80-20 rule.