Lean Six Sigma Black Belt Practice Exam — All Questions

Design of Experiments (DOE) is used to:

• a.Write the project charter
• b.Monitor a stable process
• c.Compute the p-value only
• d.Systematically study the effect of multiple factors and their interactions✓

DOE varies factors deliberately to identify significant effects and interactions.

A key advantage of a factorial DOE over changing one factor at a time is that it can:

• a.Detect interactions between factors✓
• b.Eliminate the need for data
• c.Avoid all measurement
• d.Guarantee zero defects

Factorial designs reveal interactions that one-factor-at-a-time testing misses.

A pilot of an improvement is run before full rollout mainly to:

• a.Set the USL and LSL
• b.Validate the solution and reduce risk before scaling✓
• c.Replace the control plan
• d.Skip the Control phase

Piloting validates the improvement and reduces risk before full implementation.

Poka-yoke (mistake-proofing) aims to:

• a.Add more defects for testing
• b.Increase inspection staff
• c.Prevent errors from occurring or being passed on✓
• d.Widen the specification limits

Poka-yoke prevents defects at the source or stops them from moving downstream.