Lean Six Sigma Black Belt Certification Define and Measure Phases 4

Question 1

During the Measure phase, a team discovers that operators were trained differently, causing measurement bias. Which MSA study specifically assesses whether a gauge produces different readings at different parts of its measurement range?

Accepted Answer

Linearity study

Answer

Linearity analysis evaluates whether the gauge's bias is consistent across its operating range by comparing bias at low, mid, and high reference values.

Question 2

In a DMAIC project charter, the 'business case' section primarily answers which question?

Accepted Answer

Why is solving this problem important to the organization?

Answer

The business case articulates the strategic and financial importance of the project to justify resource allocation and leadership support.

Question 3

A team creates a detailed process map and identifies a step where product sits idle for 3 hours. Using Lean terminology, what type of waste is this?

Accepted Answer

Waiting

Answer

Idle time between process steps is classified as 'Waiting' waste (one of the 8 wastes in Lean), which adds no value to the product.

Question 4

Which sampling method divides the population into subgroups and randomly selects samples from each subgroup proportionally?

Accepted Answer

Stratified random sampling

Answer

Stratified random sampling ensures representation from all relevant subgroups (strata), reducing sampling error and improving estimate precision.

Question 5

A process mean is exactly centered between the upper and lower specification limits. If the process standard deviation is σ, and the spec width is 12σ, what is the Cpk?

Accepted Answer

2.0

Answer

When centered, Cpk = Cp = (USL − LSL) / (6σ) = 12σ / 6σ = 2.0, indicating an extremely capable process.

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Define and Measure Phases 4