Practice 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 Practice flashcards as text
A gauge R&R study reveals that measurement variation accounts for 35% of total observed variation. What is the appropriate action?
Answer: Improve or replace the measurement system before proceeding
A gauge R&R above 30% indicates an unacceptable measurement system that should be improved before drawing process conclusions.
In the context of the transfer function Y = f(X), the Black Belt's primary goal during the Analyze phase is to:
Answer: Identify and validate the key X's driving Y
The Analyze phase identifies and confirms which input variables (X's) significantly influence the output (Y).
A team uses a correlation coefficient of r = -0.92. This indicates:
Answer: A strong negative relationship
An r value close to -1 indicates a strong negative linear relationship between the two variables.
Which statistical test is appropriate to determine if a process proportion defective has changed after an improvement?
Answer: 1-proportion z-test
The 1-proportion z-test (or 2-proportion test) compares a sample proportion to a target or baseline proportion.
A Black Belt wants to quantify how much a process output shifts for each unit change in a controlled input. Which analysis provides this directly?
Answer: Simple linear regression
Simple linear regression provides the slope coefficient, which quantifies the change in Y per unit change in X.
The purpose of randomization in a designed experiment is to:
Answer: Guard against the effect of lurking variables and time-related trends
Randomizing run order distributes the effects of uncontrolled nuisance variables evenly, preventing bias.
Which type of failure mode severity rating (per FMEA scale) would apply to a failure that causes injury to an end user?
Answer: 9–10
In FMEA, severity ratings of 9–10 are reserved for failures that affect safety or regulatory compliance and may injure users.