FREE Lean Six Sigma Green Belt DMAIC: Analyze Phase Techniques Questions and Answers

Question 1

A project team in a manufacturing plant is analyzing data to understand the relationship between oven temperature (an input variable, or 'x') and the resulting product hardness (an output variable, or 'y').
Both variables are continuous.
Which statistical tool is MOST appropriate for quantifying the strength and nature of this relationship?

Accepted Answer

Regression Analysis

Answer

ANOVA

Answer

Chi-Square Test

Answer

Control Chart

Question 2

What is the primary purpose of conducting a hypothesis test during the Analyze phase of a DMAIC project?

Accepted Answer

To statistically validate whether a suspected root cause has a significant effect on the process output.

Answer

To brainstorm all possible causes of a problem.

Answer

To visually display the frequency of defects.

Answer

To monitor the process performance over time.

Question 3

A team is struggling with a high rate of shipping errors. They have gathered experts from the warehouse, sales, and data entry departments for a brainstorming session to identify all potential causes for the errors. Which of the following tools would be most effective for structuring this brainstorming session and categorizing the potential causes?

Accepted Answer

Fishbone (Ishikawa) Diagram

Answer

Scatter Plot

Answer

5 Whys

Answer

Pareto Chart

Question 4

After brainstorming numerous potential causes for late deliveries, a project team has collected data on the frequency of each cause. They now need to prioritize their efforts by focusing on the causes that contribute most to the problem. Which tool should they use?

Accepted Answer

Pareto Chart

Answer

Process Map

Answer

Histogram

Answer

Run Chart

Question 5

Which of the following BEST describes the primary function of the 5 Whys technique in the Analyze phase?

Accepted Answer

To systematically drill down past symptoms to identify the fundamental root cause of a problem.

Answer

To determine the statistical significance between two variables.

Answer

To graphically display the main categories of potential causes.

Answer

To compare the means of two or more groups.

Question 6

A call center manager wants to determine if there is a statistically significant difference in the average call handling time between a team that received new training and a team that did not. Both teams have fewer than 30 members. What is the most appropriate statistical test to use?

Accepted Answer

2-Sample t-Test

Answer

Chi-Square Test

Answer

1-Sample t-Test

Answer

ANOVA