A laser surgery process has tolerances of plus or

143.
A laser surgery process has tolerances of plus or minus .01 inches. What does the process
standard deviation need to be in order for this process to have a capability ratio of 1.00?
a. 0.02 inches
b. 0.0033 inches
c. 0.002 inches
d. 0.033 inches
Answer: b
Reference: Process Capability
Difficulty: Moderate
Keywords: process, capability, standard, deviation, ratio
144. 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 ratio on a
key metric is now 1.0; what must happen with the process standard deviation?
b
Reference: Process Capability
Difficulty: Moderate
Keywords: process, capability, standard, deviation, ratio
143

Chapter 6 • Process Performance and Quality
145. 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 ratio on a
key metric is now 1.5; what must happen with the process standard deviation?
a
146. 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 ratio on a
key metric is now 1.70; what must happen with the process standard deviation?
d
Reference: Process Capability
Difficulty: Moderate
Keywords: process, capability, standard, deviation, ratio
147. 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 ratio on a
key metric is now 1.25; what must happen with the process standard deviation?
a. The process standard deviation must be reduced by about 25%.
b. The process standard deviation must be reduced by about 37%.
c. The process standard deviation must be reduced by about 50%.
d. The process standard deviation must be reduced by about 67%.
Answer: b
Reference: Process Capability
Difficulty: Moderate
Keywords: process, capability, standard, deviation, ratio