CLSSBB Certified Lean Six Sigma Black Belt (CLSSBB) Questions and Answers

In the theory of constraints the “subordinate” step refers to:

Which of the following techniques would help increase process stability when the cause of variation is a cluttered work station?

The critical path for a project is best described as the

Quality and the Critical-to-Quality (CTQ's) are both subjective terms that are defined by the _______________.

A process shows the following number of defects. Each sample size for this process is

85. 3 8 2 7 7 6 8 8 9 5.

What control chart should be used?

If the value of the test statistic had been 0.185, what action should have been taken regarding the null hypothesis?

Which of the following is the best technique for improving the precision of a designed experiment when the experimental material is NOT homogeneous?

SWOT is an acronym for:

A stable, normally distributed process with specification 3.50 .03 has = 3.51 and = .016. What percent of the production violates specification?

P(A) = .42, P(B) = .58, P(A&B) = .10. Find P(A or B).

A project activity not on the critical path has required 20% longer than the time originally allocated. The project team should:

Find the value of (2) in the ANOVA table. Assume:

P(A) = .42, P(B) = .58, P(A&B) = .10. Are A and B (statistically) independent?

George is an employee of Black, Inc. John is George’s internal customer. Which statement is true?

Use the reliability formula from the previous problem to find the reliability at MTBF.

In comparison to a full-factorial design of experiment (DOE), a traditional, one-at-a-time approach will

This QFD matrix was used in the design process for a ball point pen. What symbol is appropriate for the square labeled 1?

This QFD matrix was used in the design process for a ball point pen. What symbol is appropriate for the square labeled 11?

The null hypothesis should be:

If a process follows an exponential distribution with a mean of 25, what is the standard deviation for the process?

The formula for reliability during constant failure rate conditions is: Use this formula to find the reliability of a product at 800 hours if MTBF = 600 hours.

Which of the following is an element of standard work?

This QFD matrix was used in the design process for a ball point pen. What symbol is appropriate for the square labeled 14?

Which of the following performance measures is most appropriate for evaluating the tangible effects of a six sigma project?

“Robust design” refers to the ability of the product or service:

The average number of defects is 21.6. Find the upper control limit for the c-chart.

Perform a risk analysis to determine the expected profit or (loss) from a project which has four possible disjoint outcomes:

Outcome A shows a profit of $340,000 and has a probability of 0.25.

Outcome B shows a profit of $120,000 and has a probability of 0.40.

Outcome C shows a loss of $40,000 and has a probability of 0.10.

Outcome D shows a profit of $100,000 and has a probability of 0.25.

A machine tool vender wants to sell an injection molding machine. The current machine produces 3.2% defectives. A sample of 1100 from the vender’s machine has 2.9% defective. Do these numbers indicate that the proposed machine has a lower rate of defectives?

A population of size 1,000,000 has mean 42 and standard deviation 6. Sixty random samples, each of size 15 are selected. According to the Central Limit Theorem the distribution of the sixty sample means has a standard deviation of approximately:

A higher resolution number for an experimental design indicates that:

Calculate the main effect of factor A (i. e. A+ – A– ).

A management team lists nine goals across the top of a rectangle and 15 activity initiatives along the left hand side of the rectangle. If one of the activities strongly supports one of the goals a circle is placed in the box where that activity’s row intersects the goal’s column. If the activity’s support is very strong a “bulls eye” is placed in the box and if the support is weak a triangle is used.

This best describes which problem solving tool?

In a resolution III fractional factorial experimental design, main effects are confounded with:

The team in the above problem draws arrows from Post-It® notes that are causes to notes that are the effects of these causes. This step is best described by which approach to problem solving?

A team working with a plant relocation is tasked with designing a process for moving 180 pieces of equipment. Incoming orders may need to be filled during the move at either the old site or the new one. Transportation equipment availability is uncertain. Construction schedules at the new site is very weather dependent. The team designs a chart that attempts to cover these and other contingencies with appropriate measures dealing with each.

The tool best fitted for this task is:

A sample of size 50 from machine A has a mean of 18.2 and standard deviation 3.1. A sample of size 40 from machine B has mean 17.6 and standard deviation 2.8. Do these data indicate that the population for machine A has a larger mean? Assume the populations are normal.

Find the value of (7) in the ANOVA table. Assume:

A team’s goal is to improve information flow in a payroll function. They make thirty-three Post-It® notes, each listing an issue for further investigation. After some discussion, they group them into four categories: mandated record keeping, privacy concerns, insurance concerns and transfer concerns.

This grouping process is best described by which approach to problem solving?

The term “expected value” is closest to the term:

This experimental design is an example of:

A team wants a technique for doing an initial study of a process that not every team member is familiar with. They should use:

In a series of linked processes and associated feedback loops the product or service flows ________ and the information flows ________.

A helpful time to use a Quality Function Deployment matrix is:

If special causes are assigned in the process variations, then the UCL and LCL would be recomputed without removing those outliers. (True/False)

Legal requirements specify that a bottled product must contain at least the volume printed on the label. A bottling company wants to reduce the amount of overfilled bottles.

On the basis of the data above, what is the most effective strategy to accomplish this task?

The primary reason that most companies implement six sigma is to

SCENARIO A Six Sigma team is measuring the moisture content of corn starch as it leaves the conveyer belt of a dryer. They collect one sample four cups of starch at times indicated in the chart at fixed locations labeled A, B, C, and D across the end of the belt. See the diagram below.

The data for a nine hour period are:

Which type of variation dominates? (Hint: Plot the points on the graph above.)

Find the value of (9) in the ANOVA table. Assume:

In problem 1, do the data indicate that the population for machine A has a larger standard deviation?

The median is a better choice than the mean for a measure of central tendency if the data: