Free Lean Six Sigma Black Belt Certification Questions and Answers

Question 1

The Six Sigma methodology is heavily utilized to pinpoint and eliminate the causes of _______.

Accepted Answer

Process Variation

Answer

Six Sigma is a data-driven methodology fundamentally aimed at reducing defects and improving quality by minimizing variation within processes. By systematically identifying and eliminating the root causes of process variation, Six Sigma helps organizations achieve highly predictable and consistent outcomes. This focus on variation reduction is key to its effectiveness in enhancing efficiency and customer satisfaction.

Question 2

The limitations of control charts are the.

Accepted Answer

Voice of the process

Answer

Control charts are statistical tools that visually represent the performance of a process over time, distinguishing between common cause variation and special cause variation. They are often referred to as the 'voice of the process' because they show what the process is actually doing and its inherent capabilities and limits. While crucial for process monitoring, they do not directly reflect customer expectations or team opinions.

Question 3

When the kurtosis is 1,2754, it means

Accepted Answer

Platykurtic (flat with a short tail)

Answer

Kurtosis measures the 'tailedness' and peakedness of a probability distribution. A standard normal distribution has a kurtosis of 3 (or 0 if using excess kurtosis). A kurtosis value less than 3 (like 1.2754) indicates a platykurtic distribution, which is flatter and has shorter, fatter tails compared to a normal distribution. This suggests less extreme data points than a normal distribution would have.

Question 4

The 6Ms, or Methods, Machine, ________, Man, Mother Nature, and Materials, are represented in a fishbone diagram.

Accepted Answer

Measurements

Answer

A fishbone diagram, also known as an Ishikawa or cause-and-effect diagram, is a visual tool used to identify potential causes of a specific problem. The 6Ms framework is a common categorization for these causes, representing Man (people), Machine, Methods, Materials, Mother Nature (environment), and Measurements. 'Measurements' refers to the data collection and analysis systems that might contribute to or reveal a problem.

Question 5

What is the typical cycle time per unit in seconds for a process with an average throughput of 7,200 units per hour?

Accepted Answer

0.5

Answer

Cycle time per unit is the average time it takes to produce one unit. If a process has a throughput of 7,200 units per hour, we first convert this to units per second: 7,200 units / (3600 seconds/hour) = 2 units per second. The cycle time per unit is then the reciprocal of this rate: 1 unit / 2 units/second = 0.5 seconds per unit. This indicates that, on average, a new unit is completed every half-second.

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Practice Test

Free Lean Six Sigma Black Belt Certification Questions and Answers