A manufacturer embarking on a Six Sigma program sets the goal of having true Six Sigma capability for all processes by the end of the month.If their current process capability index on a key metric is less than 2.0 and the process capability ratio is 1.0,what must happen with the process standard deviation?
A)The process standard deviation must be doubled.
B)The process standard deviation must be reduced by a factor of six.
C)The process standard deviation must be cut in half.
D)The process tolerances should be doubled.

Question

Quizplus · Accepted Answer

To achieve true Six Sigma capability, the process must have a capability index of at least 6.0. If the current capability index is less than 2.0, it means that the process has significant room for improvement. The process standard deviation must be reduced in order to improve the capability index. Therefore, the process standard deviation must be cut in half (option C) to achieve true Six Sigma capability. Doubling the standard deviation (option A) or doubling the tolerances (option D) would only make the process less capable, and reducing the standard deviation by a factor of six (option B) would be an overcorrection, resulting in unnecessarily tight tolerances.

A Manufacturer Embarking on a Six Sigma Program Sets the Goal