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GAQM CLSSBB Certified Lean Six Sigma Black Belt (CLSSBB) Exam Practice Test

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Total 227 questions

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

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Question 1

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?

Options:

A.

Affinity diagram

B.

Inter-relationship digraph

C.

Tree diagram

D.

Process decision program chart

E.

Matrix diagram

F.

Prioritization matrix

G.

Activity network diagram

Question 2

A population is bimodal with a variance of 5.77. One hundred samples of size 30 are randomly collected and the 100 sample means are calculated. The standard deviation of these sample means is approximately:

Options:

A.

5.77

B.

2.40

C.

1.05

D.

0.44

E.

0.19

Question 3

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

Options:

A.

.90

B.

1.00

C.

.24

D.

none of the above

Question 4

(Refer to the previous problem) To estimate the within treatment variance the experimenters would calculate the variances of:

Options:

A.

all 80 readings

B.

the five replications for each run

C.

the runs for which a factor is at its lowest level

Question 5

The following data were collected on the diameters of turned shafts: 2.506 2.508 2.505 2.505. These values are:

I. Attribute data

II. Discrete data

III. Variables data

IV. Continuous data

Options:

A.

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

B.

I only

C.

II only

D.

I and IV

E.

III and IV

Question 6

This table displays the inventory of fasteners in a storage cabinet. An item is selected at random from the fastener cabinet.

Find the approximate probability it is larger than 1/2.

Options:

A.

.35

B.

.65

C.

.1106

D.

.47

E.

none of the above

Question 7

Customer requirement #3 has a ______________ relationship with technical feature #3.

Options:

A.

strong

B.

moderate

C.

weak

Question 8

Is it safe to assume that the interaction effects are negligible?

Options:

A.

yes

B.

no

C.

probably

Question 9

A team wants a technique for displaying the connection between various customer needs and various features on a product. They should use:

Options:

A.

written and diagrammed work instructions

B.

flow charts and process maps

C.

cause and effect diagrams

D.

Pareto chart

E.

relationship matrix

Question 10

The Central Limit Theorem states that the distribution of sample means approximates a normal distribution if:

Options:

A.

the population is normally distributed

B.

the sample is normally distributed

C.

the sample is randomly selected

D.

the sample size is sufficiently large

E.

the means are carefully calculated

Question 11

This is an example of part of a:

Options:

A.

QFD Matrix

B.

Activity Network Diagram

C.

Interrelationship Diagram

D.

Affinity Diagram

Question 12

A quality engineer employed by a hospital is asked to improve the process of medication storage in locked cabinets near patient doors. One defect that occurs rarely is that the medication caddy is left out when the cabinet is relocked. The engineer installs a gravity activated arm that will not permit the door to close when the caddy isn’t inside.

This improvement is best described by which approach to problem solving?

Options:

A.

5S

B.

Poka yoke

C.

Kaizen

D.

PDCA

E.

Re-engineering

Question 13

An automatic gaging system is to be installed in a process. The gage will insert data values into a data base from which machine adjustments will be made automatically. A critical factor in specifying the equipment is:

Options:

A.

communication link between gage and computer

B.

compatibility of software in the gage and in the computer

C.

adequate manual over-rides

D.

all of the above

Question 14

A team has been asked to reduce the cycle time for a process. The team decides to collect baseline data. It will do this by:

Options:

A.

seeking ideas for improvement from all stakeholders

B.

researching cycle times for similar processes within the organization

C.

obtaining accurate cycle times for the process as it currently runs

D.

benchmarking similar processes outside the organization

Question 15

There are 14 different defects that can occur on a completed time card. The payroll department collects 328 cards and finds a total of 87 defects. DPMO =:

Options:

A.

87 ÷ 328

B.

87 ÷ (328 × 14)

C.

14 ÷ 87

D.

87 ÷ 14 × 1,000,000

E.

328 ÷ 87

F.

87 × 1,000,000 ÷ (14 × 328)

Question 16

A quality leader who did extensive work with Japanese industry is:

Options:

A.

Juran

B.

Ishikawa

C.

Deming

D.

Ohno

E.

Taguchi

F.

all of the above

G.

none of the above

Question 17

Customer segmentation refers to:

Options:

A.

dividing a particular customer into parts that are more easily understood

B.

grouping customers by one or more criteria

C.

maintaining secure customer listings to minimize communication among them

D.

eliminating or “cutting off” customers with poor credit history

Question 18

The leader in the quality movement who recommended that organizations “eliminate numerical quotas for the work force and numerical goals for management”:

Options:

A.

Juran

B.

Ishikawa

C.

Crosby

D.

Feigenbaum

E.

Taguchi

F.

none of the above

Question 19

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:

Options:

A.

6

B.

6/42

C.

6/15

D.

6/ 15

E.

none of the above

Question 20

This experimental design is an example of:

Options:

A.

full factorial

B.

half fractional factorial

C.

fractional factorial

D.

ANOVA design

Question 21

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

Options:

A.

16.4

B.

3.2

C.

18.6

D.

23.2

E.

4.54

F.

12.2

G.

0.525

Question 22

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?

Options:

A.

yes

B.

no

Question 23

Find the value of (1) in the ANOVA table. Assume:

Options:

A.

16.4

B.

3.2

C.

18.6

D.

23.2

E.

4.54

F.

12.2

G.

0.525

Question 24

The preferred method for determining statistically whether factor A or B is significant requires what additional information?

Options:

A.

value of noise factors

B.

values of responses in replicate runs

C.

number of repetitions

D.

ambient conditions during the experiment

E.

blocking pattern

Question 25

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.

Find the sample linear correlation coefficient and the sample coefficient of determination for the data in problem VI.11.

Options:

A.

0.83, 0.69

B.

0.49, 0.24

C.

0.74, 0.55

D.

0.33, 0.11

Question 26

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.

After some more work on the dryer, additional data are collected which when plotted looks like this:

Which type of variation dominates?

Options:

A.

within sample

B.

sample to sample within the hour

C.

hour to hour

D.

none of the above

Question 27

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

Options:

A.

16.4

B.

3.2

C.

18.6

D.

23.2

E.

4.54

F.

12.2

G.

0.525

Question 28

Mathematically, the LEAST informative of the four measurement scales is

Options:

A.

ratio

B.

nominal

C.

ordinal

D.

interval

Question 29

This experimental design is:

Options:

A.

full factorial

B.

half factorial

C.

quarter factorial

D.

none of the above

Question 30

You are a Project Manager wanting to compare on time delivery (%) of Team Leads across 4 teams, your choice of technique would be?

Options:

A.

Hypothesis Testing

B.

Histograms

C.

Pareto chart

D.

Box Plots

Question 31

An x-bar and R chart is used to monitor a process. One week ago a new type of raw material was introduced and since that time 60 points have been plotted on the xbar chart and all are in the middle third of the chart. The corresponding 60 points on the R chart are all below the average range. This indicates that:

Options:

A.

the operator has been plotting the points incorrectly

B.

it is time to recalibrate the gage used

C.

it is time to recalculate the control limits

D.

the material manager should be asked to go back to the previous raw material so the charts will more accurately reflect the process

Question 32

Lean Enterprise is based on the premise that anywhere work is being done which of these is also occurring?

Options:

A.

Money is being spent

B.

Waste is being generated

C.

Waste is being calculated

D.

Waste is being eliminated

Question 33

The Graph which helps to identify and prioritize problems to be solved?

Options:

A.

Control Chart

B.

Histogram Chart

C.

Fish Bone Graph

D.

Pareto Chart

Question 34

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

Options:

A.

a listing of sub-processes

B.

reducing the rate for some processes

C.

the portion of the process flow chart that depends on the main flow

D.

the less important product or service stream

E.

none of the above

Question 35

This QFD matrix was used in the design process for a ball point pen. What symbol is appropriate for the square labeled 3?

Options:

A.

B.

C.

D.

none of the above

Question 36

An assembly line has 3? × 3? squares painted behind each person. Signs indicate the parts and quantities that should be placed there. This is an example of:

Options:

A.

visual factory

B.

kanban

C.

poka-yoke

D.

standard work

E.

set up time reduction (SMED)

Question 37

A complex system has many causes and effects. These may be illustrated on which of the following:

Options:

A.

matrix diagram

B.

cause and effect diagram

C.

process decision program chart

D.

affinity diagram

E.

activity network diagram

F.

tree diagram

G.

prioritization matrix

Question 38

The term used to describe the risk of a Type I error in a test of hypotheses is?

Options:

A.

power

B.

confidence level

C.

level of significance

D.

beta risk

Question 39

A principle disadvantage of fractional factorial experimental designs is:

Options:

A.

reduced cost

B.

improved accuracy

C.

confounding of effects

D.

higher confidence level

E.

reduced probability of type II errors

Question 40

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

Options:

A.

B.

C.

D.

none of the above

Question 41

An x-bar control chart has been established with control limits of 3.245 and 3.257, n = 5. An engineer collects the following sample and plots the average on the control chart: 3.257, 3,256, 3. 258, 3.259.

Options:

A.

the process is out of control

B.

the process is not out of control

C.

the engineer misused the control chart

D.

the control limits are incorrect

Question 42

This QFD matrix was used in the design process for a ball point pen. What symbol is appropriate for the square labeled 12?

Options:

A.

B.

C.

D.

none of the above

Question 43

The critical path for a project is best described as the

Options:

A.

sequence of steps with the highest costs

B.

tasks in the project that have the highest risk of failure

C.

sum of the tasks with the shortest time requirements

D.

longest path from the start to the completion of the project

Question 44

What is the value of the test statistic?

Options:

A.

0.898

B.

1.251

C.

0.429

D.

3.57

E.

none of the above

Question 45

Process data being used in the initial setup of a process are assumed to have a normal distribution. If the nominal (target) is set at the center of the distribution, and the specification limits are set at ± 3σ from the center, the Cpkis equal to

Options:

A.

0.25

B.

1.00

C.

1.33

D.

1.67

Question 46

A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18.Find control limits for the R chart.

Options:

A.

0.10 and 0.25

B.

none and 0.33

C.

0.02 and 0.33

D.

none of the above

Question 47

Which of the following tools can be used to identify and quantify the source of a problem?

Options:

A.

Affinity diagram

B.

Control chart

C.

Pareto chart

D.

Quality function deployment

Question 48

A tree diagram can be used to do which of the following?

Options:

A.

Allow a team to identify root causes even when no credible data exist

B.

Show a causality relationship

C.

Present data from a check sheet

D.

Reveal the true level of a problem’s complexity

Question 49

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

Options:

A.

True

B.

False

Question 50

A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18.A customer requires that SPC charts be done on their forms which have spaces for only 5 readings per sample. What should be the UCL and LCL for the new averages chart?

Options:

A.

12.53 and 12.71

B.

12.58 and 12.66

C.

11.61 and 13.63

D.

none of the above

Question 51

The null hypothesis should be:

Options:

A.

rejected

B.

not rejected

C.

accepted

Question 52

When Tricia empties a box of capacitors she places it at a designated spot on her work table. Sam notices the empty box and brings a full box of capacitors from the stock room. This is an example of:

Options:

A.

visual factory

B.

kanban

C.

poka-yoke

D.

standard work

E.

set up time reduction (SMED)

Question 53

An experiment is conducted by checking the effect that three different pressures have on the surface appearance of a product. Ten items are produced at each of the three pressures. The number of replications, factors and levels are:

Options:

A.

10, 3, 2

B.

10, 2, 3

C.

2, 3, 3

D.

10, 1, 3

E.

10, 3, 1

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Total 227 questions