FREE Lean Six Sigma Black Belt Certification Questions and Answers
Which of the following is one of the fundamental presumptions of a 2 Sample t-test?
Independence is an essential assumption in many statistical tests, including the t-test. It means that the values in one sample are not related to or influenced by the values in the other sample. In other words, the observations in one group should be completely unrelated to the observations in the other group.
The 6Ms, or Methods, Machine, ________, Man, Mother Nature, and Materials, are represented in a fishbone diagram.
The 6M's in a Fishbone Diagram, also known as an Ishikawa diagram or a Cause-and-Effect diagram, stand for the six major categories of potential causes of a problem or effect. However, the specific categories may vary depending on the application or industry.
Kanban creates a way to keep track of manufacturing, transportation, and delivery information so that efficient flow is created. According to the Kanban system, something must come first before anything else moves.
The method used by Kanban to achieve this is by requiring a "Signal" before anything moves in the production or supply chain. This signal is often a physical card or electronic notification that represents a demand or need for a specific item or task.
The two types of Cost of Poor Quality (COPQ) are Visible Costs and Hidden Costs. Among these, which is a visible cost?
Cost of Poor Quality (COPQ) can be classified into two main categories: Visible Costs and Hidden Costs. "Return items" is considered a Visible Cost.
Visible Costs are those costs associated with poor quality that are readily identifiable and can be directly attributed to quality issues. These costs are visible and are often captured in the organization's accounting and financial records. They are relatively easy to quantify and track. Return items, also known as product returns or product recalls, are one example of visible costs.
Which two classifications apply to Special Cause Variation?
Special Cause Variation falls into two categories: Assignable Cause Variation and Pattern Cause Variation.
Understanding the types of special cause variation is important in Six Sigma methodology, as it helps practitioners to distinguish between normal process variation and variation that requires action to improve process performance. By identifying and addressing special cause variation, Six Sigma aims to improve process stability and consistency, reduce defects, and increase customer satisfaction.
The concept of _______ deals with the consistency of process workers?
Standard Operating Procedures (SOPs) are a concept that addresses the consistency of process workers and ensures that tasks and processes are carried out in a uniform and standardized manner.
Taking measurements that are appropriate means
Appropriate measures mean that measurements are suitable and relevant for the purpose they are intended. In other words, appropriate measures are measures that provide meaningful and useful information to support decision-making or evaluation. The choice of appropriate measures depends on the specific context, the goals of the measurement, and the characteristics of the process or system being measured.
How many runs should there be in a two-level complete factorial DOE with four factors?
In a two-level full factorial Design of Experiments (DOE) with four factors, there should be 16 runs.
What does a T-test with two samples do?
A two-sample t-test is a statistical test used to compare the means of two independent samples to determine if there is a statistically significant difference between them.
The two-sample t-test is commonly employed when you have two groups (samples) of data and you want to assess whether the means of a certain variable differ significantly between these two groups. The variable being analyzed is typically continuous or numerical in nature.
When the kurtosis is 1,2754, it means
A kurtosis of -1.2754 indicates platykurtic distribution, which means that the distribution has a flat peak and shorter tails than a normal distribution. In other words, the platykurtic distribution has less frequent extreme values (outliers) than a normal distribution. This is in contrast to a leptokurtic distribution, which has a higher peak and longer tails than a normal distribution and more frequent extreme values. Finally, a mesokurtic distribution has the same kurtosis as a normal distribution (i.e., kurtosis of 0), which means it has a bell-shaped curve and no significant outliers.
The 6Ms in a fishbone diagram stand for methods, machines, man, mother nature,________, and materials.
In a Fishbone Diagram, the missing "M" typically stands for "Measurement." So, the 6M's in a Fishbone Diagram are:
Methods
Measurement
Machine
Man
Mother Nature
Materials
The Fishbone Diagram, also known as the Ishikawa Diagram or Cause-and-Effect Diagram, is a visual tool used to identify potential root causes of a problem or effect by organizing them into categories and displaying them in a fishbone-shaped diagram. The 6M's represent common categories of potential root causes that can be considered when analyzing a problem.
The Six Sigma methodology is heavily utilized to pinpoint and eliminate the sources of ___________.
A primary goal of the Six Sigma methodology is to identify and remove or reduce the causes of process variation to achieve higher process stability and consistency. Reducing process variation is a key factor in improving quality, increasing efficiency, and reducing defects in a product or service.
What is the typical cycle time per unit in seconds for a process with an average throughput of 7,200 units per hour?
To calculate the average Cycle Time for a process given the average throughput and assuming a constant flow, you can use the following formula:
Cycle Time = (3600 / Throughput)
Where 3600 is the number of seconds in an hour.
Using this formula with the given values:
Cycle Time = (3600 / 7200) seconds
Cycle Time = 0.5 seconds
Therefore, the average Cycle Time per unit is 0.5 seconds, as given in the problem statement.
The limitations of control charts are the.
Control charts and their limits are considered the Voice of the process in Six Sigma methodology. The process is said to be in control when the data points fall within the control limits, which are determined based on the process data. Control charts help to monitor and track process performance over time and provide a visual representation of the data. By analyzing control charts, Six Sigma practitioners can determine if the process is stable or if there is evidence of special causes of variation that need to be addressed. In this way, the control charts and their limits provide insight into the behavior of the process and can help guide decision-making for process improvement efforts.
The Six Sigma methodology is heavily utilized to pinpoint and eliminate the causes of _______.
Six Sigma methodology is used to identify and remove causes of process variation in order to improve the quality and consistency of a product or service. By reducing process variation, Six Sigma aims to reduce defects, increase efficiency, and improve customer satisfaction.
Which tool is used to compare sample proportions from more than two different samples?
Contingency tables, also known as cross-tabulations or two-way tables, are commonly used to compare more than two sample proportions with each other. Contingency tables allow researchers to analyze the relationship between two categorical variables and examine how the proportions or frequencies of different categories in one variable vary across different categories of the other variable.