Lean Six Sigma Green Belt Certification Analyze Phase Tools 3

Question 1

A process has Cp = 1.5 but Cpk = 0.9. What does this combination indicate?

Accepted Answer

The process has adequate spread but is off-center relative to specification

Answer

When Cp exceeds Cpk, the process spread fits within specs but the process mean is shifted away from the target.

Question 2

Which tool is most appropriate for visually separating the distribution of a continuous output variable across three or more categorical input groups?

Accepted Answer

Box plot

Answer

Box plots side-by-side allow quick visual comparison of median, spread, and outliers across multiple groups.

Question 3

A team is analyzing warranty data coded as 'Pass' or 'Fail' against two suppliers (A and B). Which statistical test is most appropriate?

Accepted Answer

Chi-square test of independence

Answer

A chi-square test of independence evaluates whether two categorical variables (supplier and pass/fail) are related.

Question 4

What is the purpose of the 'Is/Is Not' analysis tool in the Analyze phase?

Accepted Answer

To narrow down potential root causes by defining where the problem does and does not occur

Answer

Is/Is Not analysis systematically scopes the problem by identifying boundaries where the issue exists versus where it does not.

Question 5

In hypothesis testing, a p-value of 0.03 with α = 0.05 leads to which conclusion?

Accepted Answer

Reject the null hypothesis; the difference is statistically significant

Answer

Since p (0.03) < α (0.05), there is sufficient evidence to reject the null hypothesis at the 5% significance level.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Analyze Phase Tools 3