Certified Six Sigma Black Belt Exam FREE Certified Six Sigma Black Belt Statistical Process Control (SPC) Questions and Answers 2

Question 1

A process has a Cp of 1.33 and a Cpk of 0.89. What does this indicate?

Accepted Answer

The process is capable but not centered within the specification limits

Answer

The process is both capable and centered

Answer

The process is neither capable nor centered

Answer

The specification limits are too narrow

Question 2

Which control chart is most appropriate for monitoring the number of paint defects found on each automobile body panel when the inspection area varies by panel size?

Accepted Answer

u-chart

Answer

c-chart

Answer

np-chart

Answer

p-chart

Question 3

On an X-bar and R chart, what is the primary purpose of rational subgrouping?

Accepted Answer

To group data so that special cause variation appears between subgroups rather than within them

Answer

To maximize variation within subgroups and minimize variation between subgroups

Answer

To ensure subgroups are randomly selected from the entire production run

Answer

To guarantee equal sample sizes across all subgroups

Question 4

A process is in statistical control but producing 4% nonconforming output. What is the correct course of action?

Accepted Answer

Implement fundamental process changes to reduce common cause variation

Answer

Adjust the process whenever a defective unit is detected

Answer

Add more control chart rules to detect shifts earlier

Answer

Tighten the control limits on the existing chart

Question 5

What does the Western Electric Rule for 2 out of 3 consecutive points beyond 2 sigma indicate on a control chart?

Accepted Answer

A potential small shift in the process mean

Answer

A run pattern suggesting a trend

Answer

Random variation within expected limits

Answer

A definitive out-of-control condition requiring process shutdown

Question 6

When calculating control limits for an X-bar chart with subgroup size n=5, which factor is used to estimate the process standard deviation from the average range?

Accepted Answer

d2

Answer

A2

Answer

D4

Answer

E2

A process has a Cp of 1.33 and a Cpk of 0.89.What does this indicate?

A process has a Cp of 1.33 and a Cpk of 0.89.
What does this indicate?