General Flashcards
7 cards from real Certified Six Sigma Black Belt Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 General flashcards as text
In the DMAIC cycle, which phase focuses on identifying root causes of defects using data analysis tools?
Answer: Analyze
The Analyze phase uses statistical tools like fishbone diagrams and hypothesis testing to identify and verify root causes.
Which Six Sigma metric represents the number of defects per million opportunities (DPMO) at a Six Sigma quality level?
Answer: 3.4
A true Six Sigma process produces no more than 3.4 DPMO, accounting for a 1.5 sigma long-term shift.
A Black Belt is conducting a hypothesis test and sets alpha (α) = 0.05. What does this significance level represent?
Answer: The acceptable probability of rejecting a true null hypothesis
Alpha is the significance level representing the probability of committing a Type I error — rejecting a true null hypothesis.
Which tool is most appropriate for prioritizing potential failure modes by their Risk Priority Number (RPN)?
Answer: FMEA
Failure Mode and Effects Analysis (FMEA) calculates RPN by multiplying Severity, Occurrence, and Detection ratings to prioritize risks.
What is the primary purpose of a Box-Cox transformation in Six Sigma analysis?
Answer: To normalize non-normal data before parametric testing
The Box-Cox transformation applies a power function to non-normal data to make it approximately normal, enabling valid parametric analysis.
In regression analysis, what does an R² value of 0.85 indicate?
Answer: 85% of the variation in Y is explained by the model
R² (coefficient of determination) indicates that 85% of the variability in the response variable is explained by the predictor variables in the model.
Which phase of DMAIC is primarily responsible for establishing baseline process capability metrics?
Answer: Measure
The Measure phase collects data and calculates baseline metrics like Cp, Cpk, and sigma level to quantify current process performance.