A Manufacturer Embarking on a Six Sigma Program Sets the Goal

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 1.5, what must happen with the process standard deviation?

A) The process standard deviation must be reduced by 25%.
B) The process standard deviation must be reduced by 33%.
C) The process standard deviation must be reduced by 50%.
D) The process standard deviation must be reduced by 67%.