Lean Six Sigma Yellow Belt Certification The Measure Phase 4

Question 1

In the context of the Measure phase, 'operational definitions' are important because they:

Accepted Answer

Ensure everyone measures the same thing consistently

Answer

Operational definitions provide precise, agreed-upon descriptions of what is being measured so all collectors gather data the same way.

Question 2

Which chart is most appropriate for monitoring the proportion of defective items when subgroup sizes vary?

Accepted Answer

p-chart

Answer

The p-chart tracks the proportion (fraction) of defective items and accommodates variable subgroup sizes, unlike the np-chart which requires constant subgroup size.

Question 3

A process has a mean of 50 and standard deviation of 2. The specification limits are 44 to 56. What is the Cp value?

Accepted Answer

1.00

Answer

Cp = (USL - LSL) / (6σ) = (56 - 44) / (6 × 2) = 12 / 12 = 1.00.

Question 4

What is the main limitation of using a histogram alone to assess process capability?

Accepted Answer

It does not reveal the time sequence of data, masking instability

Answer

A histogram collapses all time information, so it cannot reveal shifts, trends, or special causes that a time-ordered control chart would detect.

Question 5

Which of the following best describes 'measurement system bias'?

Accepted Answer

A consistent, systematic offset between measured and true values

Answer

Bias (accuracy error) is the difference between the average measured value and the true (reference) value, indicating a systematic shift.

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification The Measure Phase 4