Free Lean Six Sigma Yellow Belt Certification Prep Questions and Answers — Questions and Answers

Question 1: Which of the following is most likely a CTQ (Critical-to-Quality) when buying a service?

Required no redo
Was timely in delivery
Documentation is clear
All of the above (Correct answer)

Correct answer: All of the above

Critical-to-Quality (CTQ) characteristics are key measurable attributes of a product or service that are crucial for customer satisfaction. When purchasing a service, customers typically value timeliness, the absence of errors (requiring no redo), and clear documentation. Therefore, all these factors are critical to a customer's perception of a high-quality service.

Question 2: Which of the following statements about the Six Sigma approach is accurate?

It is a methodology based on factual data. (Correct answer)
The main objective is to make the organization as "lean" as possible.
Has the goal of reducing defects to 13.4 per million opportunities
It is only used to achieve improvements in the manufacturing process.

Correct answer: It is a methodology based on factual data.

Six Sigma is fundamentally a data-driven methodology that employs statistical analysis to identify and eliminate defects and improve processes. Its core principle is to make decisions and drive improvements based on objective, factual data rather than assumptions or intuition. While it aims for lean processes and reduces defects, its foundation is rooted in empirical evidence.

Question 3: The Y in the equation Y = F(X) is

Prohibited
Process
Tool
Output (Correct answer)

Correct answer: Output

In the Six Sigma equation Y = F(X), Y represents the desired outcome, result, or characteristic of a process, which is the 'output.' The X's represent the input variables or factors that influence that output. The equation illustrates that the output (Y) is a function of, or dependent on, the inputs (X).

Question 4: What is the effect of applying Six Sigma?

Decrease in cost and quality
The production of defective products is reduced (Correct answer)
Decreased customer retention
Delay in shipping products

Correct answer: The production of defective products is reduced

The primary objective of applying Six Sigma is to reduce process variation and defects to a near-zero level, specifically aiming for 3.4 defects per million opportunities. By achieving this, organizations significantly decrease the production of defective products or services, leading to improved quality, increased customer satisfaction, and substantial cost savings.

Question 5: Which Six Sigma step involves validating the measurement system and measuring the performance of the current process?

Define
Analyze
Improve
Measure (Correct answer)

Correct answer: Measure

The 'Measure' phase in the DMAIC (Define, Measure, Analyze, Improve, Control) methodology is dedicated to collecting data about the current process performance. This includes validating the accuracy and reliability of the measurement system (e.g., through Gauge R&R studies) and then systematically gathering baseline data on the process's defects, cycle time, and other relevant metrics to understand its current state.

Question 6: Determine the key distinction between DMAIC and DMADV.

DMAIC- Design of new products or improvement in existing products; DMAVD and DMAIC are the same
DMADV- Design of new products or improvement in existing products; DMAIC-Improvement in an existing process. (Correct answer)
DMAVD- Improvement in an existing process.
None of the above

Correct answer: DMADV- Design of new products or improvement in existing products; DMAIC-Improvement in an existing process.

DMAIC (Define, Measure, Analyze, Improve, Control) is a methodology used for improving *existing* processes that are not meeting customer requirements. DMADV (Define, Measure, Analyze, Design, Verify), also known as Design for Six Sigma (DFSS), is used for *designing new* products or processes, or redesigning existing ones, to meet Six Sigma quality levels from the outset, ensuring quality is built in.

Question 7: Choose which tool was not utilized during the analyze phase.

Hypothesis testing
Analysis of data
Solution Design Matrix (Correct answer)
FMEA

Correct answer: Solution Design Matrix

The Analyze phase in Six Sigma focuses on identifying the root causes of problems and understanding process behavior. Tools like hypothesis testing, various forms of data analysis (e.g., regression, ANOVA), and FMEA (Failure Mode and Effects Analysis) are crucial for this. A Solution Design Matrix, however, is typically used in the 'Improve' or 'Design' phase to evaluate and select potential solutions, not primarily for root cause analysis.

Question 8: A phase input is the baseline process capability:

Define
Measure
Analyze (Correct answer)
Check

Correct answer: Analyze

Baseline process capability is typically established during the 'Measure' phase, where extensive data is collected to understand the current performance of a process. This established baseline capability then serves as a crucial input for the 'Analyze' phase, allowing the team to compare current performance against desired targets, identify gaps, and pinpoint areas for improvement.

Question 9: The process map that is generated after identifying areas for improvement on an existing process map is referred to as:

Cross-functional process map
Process map "To-be" (Correct answer)
Process map "as is"
Diagram Swim Lane

Correct answer: Process map "To-be"

In process improvement, an 'as-is' process map illustrates the current state of a process, including all its inefficiencies and bottlenecks. After analyzing this current state and identifying opportunities for improvement, a 'to-be' process map is then created. This 'to-be' map visually represents the desired, optimized future state of the process, incorporating the planned improvements.

Question 10: Which of the following parties is tasked with contributing to the process?

Customers
Employees
End users
Suppliers (Correct answer)

Correct answer: Suppliers

In any process, various parties contribute, but suppliers are specifically tasked with providing the necessary inputs—whether materials, information, or services—that enable the process to function. Without the timely and quality contribution of suppliers, the process cannot begin, proceed effectively, or produce its intended output. Therefore, suppliers are critical contributors.

Question 11: Which of the following is an example of a Design for Six Sigma (DFSS) methodology?

DMADV (Correct answer)
COPQ
DMAIC
SIPOC

Correct answer: DMADV

Design for Six Sigma (DFSS) is a methodology specifically used to design new products or processes, or redesign existing ones, to achieve Six Sigma quality levels from the very beginning. DMADV (Define, Measure, Analyze, Design, Verify) is the most common and widely recognized methodology within the DFSS framework, focusing on proactive quality design rather than reactive improvement of existing processes.

Question 12: What is "Little's" formula for estimating average lead time?

Production capacity, divided by the number of units required
Production capacity, multiplied by number of units required
Number of units required, divided by production capacity (Correct answer)
Number of units required, multiplied by production capacity

Correct answer: Number of units required, divided by production capacity

Little's Law states that the average number of items in a stable system (Work In Process, WIP) is equal to the average arrival rate (Throughput) multiplied by the average time an item spends in the system (Lead Time). Rearranging this, Lead Time = WIP / Throughput. In the given options, 'Number of units required' can be interpreted as WIP, and 'production capacity' as throughput, making 'Number of units required, divided by production capacity' the closest representation for estimating average lead time.

Question 13: The DPMO, which stands for _________________, is a crucial indicator in Six Sigma.

Defects per million opportunities (Correct answer)
Defects by management oversight
Delayed production metrics output
Developed production management oversight

Correct answer: Defects per million opportunities

DPMO is a fundamental metric in Six Sigma, standing for 'Defects Per Million Opportunities.' It quantifies the number of defects observed in a process relative to the total number of opportunities for a defect to occur, scaled to a million opportunities. This provides a standardized and comprehensive measure of process performance and quality.

Question 14: The different Failure Modes are ranked according to how they will affect the results of the relevant process using the RPN, or Risk Priority Number.

False
True (Correct answer)

Correct answer: True

In Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is calculated by multiplying the Severity, Occurrence, and Detection ratings for each potential failure mode. This RPN provides a numerical ranking that helps prioritize which failure modes pose the greatest risk to the process results, thereby guiding efforts to mitigate them effectively.

Question 15: The fact that the data gathered from this activity is precise and certain is one of the main advantages of your team working together to produce an X-Y Diagram.

False (Correct answer)
True

Correct answer: False

An X-Y Diagram (or Cause & Effect Matrix) is a qualitative tool used in Six Sigma to prioritize potential input variables (X's) based on their perceived impact on output variables (Y's). While valuable for team consensus and identifying key relationships, the ratings are based on subjective team judgment and brainstorming, not precise, certain, or statistically validated data. Therefore, the statement is false.

Question 16: What are the goals and applications of data visualization?

Enables the organization to be 80% correct today, rather than 100% correct in 6 months
Identifies and eliminates the root cause of faults or problems
Allows conclusions to be drawn from graphical data analysis (Correct answer)
Encourages out-of–the-box thinking to generate as many ideas as possible

Correct answer: Allows conclusions to be drawn from graphical data analysis

The primary goal of data visualization is to present complex data in an easily understandable graphical format. This allows users to quickly identify patterns, trends, outliers, and relationships within the data. By making data more accessible and interpretable, visualization facilitates the drawing of meaningful insights and conclusions that might be difficult to discern from raw numerical data alone.

Free Lean Six Sigma Yellow Belt Certification Prep Questions and Answers

Which of the following is most likely a CTQ (Critical-to-Quality) when buying a service?