Analyze Phase Tools Flashcards
7 cards from real Lean Six Sigma Green 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 Analyze Phase Tools flashcards as text
A process has Cp = 1.5 but Cpk = 0.9. What does this combination indicate?
Answer: The process has adequate spread but is off-center relative to specification
When Cp exceeds Cpk, the process spread fits within specs but the process mean is shifted away from the target.
Which tool is most appropriate for visually separating the distribution of a continuous output variable across three or more categorical input groups?
Answer: Box plot
Box plots side-by-side allow quick visual comparison of median, spread, and outliers across multiple groups.
A team is analyzing warranty data coded as 'Pass' or 'Fail' against two suppliers (A and B). Which statistical test is most appropriate?
Answer: Chi-square test of independence
A chi-square test of independence evaluates whether two categorical variables (supplier and pass/fail) are related.
What is the purpose of the 'Is/Is Not' analysis tool in the Analyze phase?
Answer: To narrow down potential root causes by defining where the problem does and does not occur
Is/Is Not analysis systematically scopes the problem by identifying boundaries where the issue exists versus where it does not.
In hypothesis testing, a p-value of 0.03 with α = 0.05 leads to which conclusion?
Answer: Reject the null hypothesis; the difference is statistically significant
Since p (0.03) < α (0.05), there is sufficient evidence to reject the null hypothesis at the 5% significance level.
A Green Belt uses a regression equation: Y = 12.4 + 3.2X. If X increases by 2 units, what is the predicted change in Y?
Answer: 6.4 units
The slope (3.2) represents the change in Y per unit change in X, so a 2-unit increase gives 3.2 × 2 = 6.4.
Which graphical tool is specifically designed to display the stability of a process over time using control limits?
Answer: Control chart
Control charts plot sequential data with statistically calculated upper and lower control limits to assess process stability.