Lean Six Sigma Black Belt Practice Exam — All Questions
4 questions
Improve & DOE
Design of Experiments (DOE) is used to:
- a.Monitor a stable process
- b.Systematically study the effect of multiple factors and their interactions✓
- c.Write the project charter
- d.Compute the p-value only
DOE varies factors deliberately to identify significant effects and interactions.
Improve & DOE
A key advantage of a factorial DOE over changing one factor at a time is that it can:
- a.Detect interactions between factors✓
- b.Avoid all measurement
- c.Eliminate the need for data
- d.Guarantee zero defects
Factorial designs reveal interactions that one-factor-at-a-time testing misses.
Improve & DOE
A pilot of an improvement is run before full rollout mainly to:
- a.Replace the control plan
- b.Skip the Control phase
- c.Validate the solution and reduce risk before scaling✓
- d.Set the USL and LSL
Piloting validates the improvement and reduces risk before full implementation.
Improve & DOE
Poka-yoke (mistake-proofing) aims to:
- a.Increase inspection staff
- b.Widen the specification limits
- c.Add more defects for testing
- d.Prevent errors from occurring or being passed on✓
Poka-yoke prevents defects at the source or stops them from moving downstream.