The Analyze 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 Analyze Phase flashcards as text
What is the primary purpose of a Fishbone (Ishikawa) diagram in the Analyze phase?
Answer: To organize and display potential causes of a problem
A Fishbone diagram visually organizes potential causes of a problem into categories (e.g., Man, Machine, Method, Material) to facilitate root cause analysis.
During root cause analysis, a team repeatedly asks 'why' after each answer. After five iterations they identify an equipment calibration issue. What technique did they use?
Answer: 5 Whys
The 5 Whys technique iteratively asks 'why' to drill past symptoms and surface the true root cause of a problem.
Which statement about correlation and causation is correct in Lean Six Sigma analysis?
Answer: Correlation indicates a relationship but does not prove causation
Correlation shows that two variables move together, but additional analysis (such as DOE or subject matter expertise) is required to establish a causal relationship.
A Yellow Belt team is analyzing cycle time data and finds a data point far outside the typical range. What is this called?
Answer: An outlier
An outlier is a data point that falls significantly outside the expected range and can distort analysis if not investigated and addressed appropriately.
In a Lean Six Sigma Analyze phase, what does 'value-added' activity mean?
Answer: An activity the customer is willing to pay for that transforms the product
A value-added activity must meet three criteria: the customer is willing to pay for it, it transforms the product or service, and it is done correctly the first time.
Which graphical tool shows individual data points over time and includes control limits to detect special cause variation?
Answer: Control chart
A control chart (run chart with control limits) distinguishes between common cause (random) variation and special cause (assignable) variation over time.
A team wants to determine if there is a statistically significant difference between the defect rates of two shifts. Which tool is most appropriate?
Answer: Hypothesis test (e.g., 2-proportion test)
A 2-proportion hypothesis test statistically compares defect rates between two groups to determine if the difference is real or due to chance.