Question

Which statement is an accurate description of a process that is "capable"?

A) Process variability is less than variation allowed by design specifications.
B) Assignable variation is greater than random variation.
C) No random variation is evident, only assignable variation.
D) Process variability is greater than variation allowed by design specifications.
E) Assignable variation is less than random variation.

Answer 1

A capable process is one where the process variability is less than the variation allowed by the design specifications, indicating consistent quality and stability in meeting criteria set forth.

Step-by-step explanation:

A capable process is one where the process variability is well within the limits defined by the design specifications. This implies that the outputs of the process fall within a range that meets the quality criteria set forth, consistently over time. The accurate description of a capable process is therefore: A) Process variability is less than variation allowed by design specifications. When this condition is true, it means that the natural or common cause of variation in the process is controlled and predictably stays within the acceptable range, reflecting a stable process that produces products that meet specifications.