The Measure Phase Flashcards
7 cards from real Lean Six Sigma Yellow Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 The Measure Phase flashcards as text
Which type of data is collected when you record whether a product passes or fails inspection?
Answer: Attribute data
Attribute data (also called discrete data) classifies items into categories such as pass/fail or defective/non-defective.
A control chart shows a process with all points within control limits but 9 consecutive points on the same side of the centerline. This indicates:
Answer: A special cause of variation is present
Nine or more consecutive points on one side of the centerline is a Western Electric rule violation indicating a special cause of variation.
What does the 'sigma level' of a process primarily indicate?
Answer: How many defects occur per million opportunities
Sigma level indicates process capability expressed as defects per million opportunities (DPMO), with higher sigma meaning fewer defects.
In a Gauge R&R study, 'reproducibility' refers to variation caused by:
Answer: Different operators measuring the same part
Reproducibility measures the variation in average measurements made by different operators using the same gauge on the same part.
Which sampling method divides the population into subgroups and randomly samples from each subgroup?
Answer: Stratified sampling
Stratified sampling divides the population into homogeneous subgroups (strata) and takes random samples from each stratum.
A process produces 150 defects in 500 units where each unit has 10 opportunities for defects. What is the DPO?
Answer: 0.03
DPO = Defects / (Units × Opportunities) = 150 / (500 × 10) = 150 / 5000 = 0.03.
What is the primary purpose of a time-series plot (run chart) in the Measure phase?
Answer: To display process data over time and detect trends or shifts
A run chart plots data points in time order to reveal trends, shifts, cycles, or other non-random patterns in process performance.