Lean Six Sigma Green Belt Certification DMAIC: Analyze Phase Techniques 2

Question 1

A Green Belt notices that a process produces more defects on Monday mornings than other times. Which stratification analysis should be performed first?

Accepted Answer

Time-based stratification by shift and day

Answer

Time-based stratification breaks data into segments (shift, day, week) to reveal patterns linked to specific conditions like Monday morning starts.

Question 2

In hypothesis testing for a Green Belt project, a p-value of 0.03 is obtained with α = 0.05. What is the correct conclusion?

Accepted Answer

Reject the null hypothesis

Answer

Since p-value (0.03) < α (0.05), there is sufficient evidence to reject the null hypothesis.

Question 3

Which tool is BEST used to quantify the relationship strength between a continuous X variable and a continuous Y variable during the Analyze phase?

Accepted Answer

Pearson correlation coefficient

Answer

Pearson correlation coefficient measures the strength and direction of a linear relationship between two continuous variables.

Question 4

A team uses a multi-vari chart and finds that variation is greatest between different machines compared to within-machine or time-based variation. This indicates which type of variation source?

Accepted Answer

Positional variation

Answer

Variation between different machines (or positions/fixtures) is classified as positional variation in a multi-vari study.

Question 5

During the Analyze phase, a team wants to determine whether training (yes/no) affects defect rate (defective/not defective). Which statistical test is most appropriate?

Accepted Answer

Chi-square test of independence

Answer

Chi-square test of independence is used when both the input and output variables are categorical (attribute data).

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification DMAIC: Analyze Phase Techniques 2