Assessment Flashcards
7 cards from real Lean Six Sigma Black 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 Assessment flashcards as text
Which measurement system analysis (MSA) statistic indicates the proportion of total variation attributable to the measurement system itself?
Answer: %Contribution
%Contribution from MSA (Gage R&R) shows what fraction of total observed variation is due to the measurement system rather than part-to-part variation.
A Black Belt performs a Gage R&R study and finds the Number of Distinct Categories (ndc) is 2. What does this indicate?
Answer: The gage can only distinguish good parts from bad parts
An ndc of 1 or 2 means the gage can barely distinguish two categories (pass/fail), making it inadequate for process monitoring; ndc ≥ 5 is generally required.
In a process capability study, a Cpk of 0.85 with a Cp of 1.40 tells the Black Belt what about the process?
Answer: The process is capable but significantly off-center
Cp measures potential capability (spread vs. spec width) while Cpk measures actual capability; a high Cp with low Cpk indicates good spread but poor centering.
Which type of data collection plan element ensures that samples are collected at the correct time intervals to capture process variation?
Answer: Sampling strategy
The sampling strategy specifies when, how often, and how many units to sample to representatively capture the process variation of interest.
A team uses a Kano model during assessment. Which category describes features customers do not explicitly request but whose absence causes dissatisfaction?
Answer: Basic needs (Must-be)
Basic needs (Must-be or threshold attributes) are expected by customers and their absence causes strong dissatisfaction, but their presence does not increase satisfaction.
When conducting a process capability analysis on non-normal data, which transformation is most commonly applied before calculating Cp and Cpk?
Answer: Box-Cox transformation
The Box-Cox power transformation family is routinely used to normalize skewed process data so that standard capability indices remain valid.
In a multi-vari study used during the Measure phase, which variation source is examined by comparing measurements taken consecutively within a single unit or run?
Answer: Within-piece variation
Within-piece variation captures differences within a single part or unit (e.g., taper in a machined bore), which is one of three classical multi-vari families.