Certified Six Sigma Black Belt Exam Assessment 4

Question 1

During a measurement system assessment, an appraiser consistently measures parts 0.5 mm higher than the true reference value across all ranges. This error is classified as:

Accepted Answer

Bias

Answer

Bias is the systematic difference between the observed average measurement and the true (reference) value across all measurements.

Question 2

A process capability assessment yields Cp = 1.8 and Cpk = 0.9. What does this combination indicate?

Accepted Answer

The process has adequate spread but is significantly off-center

Answer

High Cp with low Cpk indicates the process has sufficient potential capability (spread fits within spec) but is poorly centered relative to specification limits.

Question 3

Which assessment approach quantifies the financial impact of poor quality, categorizing costs into prevention, appraisal, internal failure, and external failure?

Accepted Answer

Cost of Poor Quality (COPQ) analysis

Answer

COPQ analysis uses the PAF (Prevention, Appraisal, Failure) model to categorize and quantify quality-related costs.

Question 4

A linearity assessment of a measurement gauge shows that bias increases as the measured value increases. What corrective action is most appropriate?

Accepted Answer

Recalibrate the gauge across its full operating range

Answer

Linearity error (bias varying with the magnitude of measurement) is corrected by calibrating the gauge across its entire operating range, not just at one point.

Question 5

During a process assessment, a Black Belt calculates a Z-score of 2.5 for the lower specification limit and 1.5 for the upper specification limit. What is Cpk?

Accepted Answer

0.50

Answer

Cpk = min(Z_LSL, Z_USL) / 3 = min(2.5, 1.5) / 3 = 1.5 / 3 = 0.50.

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Assessment 4