Free Certified Six Sigma Black Belt Practice Questions and Answers

Question 1

In a project report, a Black Belt practitioner notes, "we are 95% confident that the average age of consumers of Product A is between 34 and 38 years." What exactly is a confidence interval?

Accepted Answer

They are 95% confident about the average age of the population.

Answer

They are 5% confident about the average age of the sample.

Answer

They are 95% confident about the average age of the sample.

Answer

They are 5% confident about the average age of the population.

Question 2

The Central Limit Theorem states that, regardless of the population from which data is obtained, the sampling distribution of the mean is:

Accepted Answer

Normally distributed.

Answer

Skewed towards the outliers.

Answer

Skewed towards the standard deviation.

Answer

Abnormally distributed.

Question 3

Process capability (Cp) refers to a process that, in most cases, results in the production of a product that meets client and design standards. A perfect process will have the following Cp value:

Accepted Answer

Greater than one

Answer

Less than one

Answer

Within one standard deviation of mean

Answer

Equal to one

Question 4

Which of the control charts must include at least 20 subgroups of observed data to determine if a process is under control or not?

Accepted Answer

R-chart

Answer

P-chart

Answer

Y-chart

Answer

C-chart

Question 5

A basic linear regression line compares the rate of change of one variable to another. The resultant equation is shown below. What does (b0) stand for?

Accepted Answer

Intercept

Answer

Known error term.

Answer

Slope

Answer

Random error term

Question 6

A Black Belt practitioner is engaged to discover a number of Critical to Price (CTP) variables in order to simplify and minimize costs connected with producing Product A. The following are CTP factors EXCEPT:

Accepted Answer

Loan refinancing costs

Answer

Shipping costs

Answer

Assembly costs

Answer

Component costs

Question 7

According to the manager of a national grocery store chain, just 6% of consumers who have questionnaires addressed to them complete them entirely. What is the term for this sort of sampling error?

Accepted Answer

Non-response error

Answer

Mailing error

Answer

Non-return error

Answer

Lazy consumer error

Question 8

Which of the following components does not appear in implementation plans?

Accepted Answer

Cost/Benefit ratios

Answer

Work breakdown structure

Answer

Planned audits of work completion

Answer

Risk management plans

Question 9

A Belt needed to track the percentage of defectives in a specific sample set for her injection molding project, so she used a __________ to show the data.

Accepted Answer

P Chart

Answer

C Chart

Answer

Xbar Chart

Answer

Individual Chart

Question 10

When a Belt Poka-Yoke completely removes a flaw from the process, she should monitor the activity using an effective SPC system on the trait of interest in the defect as a kind of early warning.

Accepted Answer

Incorrect

Answer

Correct