Which of the following statements is best regarding process variation?
I. All variation is due to chance.
II. Random variation is inherent in the process.
III. Assignable variation is due to a specific cause.
A) I and II are true
B) I and III are true
C) II and III are true
D) I only is true
E) II only is true

Question

Quizplus · Accepted Answer

II is true because there will always be random variation that cannot be controlled in any process. III is true because there are often identifiable causes for non-random, or assignable, variation that can be addressed and improved upon in the process. It is not accurate to say that all variation is due to chance (I), as some variation can be traced to specific causes.

Which of the Following Statements Is Best Regarding Process Variation