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

Demo: 53 questions
Total 227 questions

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

Question 1

An x-bar and R chart has four part measurements per sample. The control limits on the averages chart are 2.996 and 3.256. Assume the process data form a normal distribution. What is the probability that the next plotted point falls outside the control limits?

Options:

A.

0.00135

B.

0.0027

C.

0.0054

D.

none of the above

Question 2

Compared to a two-level factorial experiment, which of the following is an advantage of an experiment in three levels?

Options:

A.

Interaction effects can be estimated

B.

Curvature can be characterized

C.

The design can be augmented

D.

Efficiency is maximized in the experimental effort

Question 3

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 4

The following contingency table was developed for an organization.

On the basis of this information, what is the expected number of oil changes for Station 1?

Options:

A.

70

B.

76

C.

80

D.

100

Question 5

This QFD matrix was used in the design process for a ball point pen. What symbol is appropriate for the square labeled 4?

Options:

A.

B.

C.

D.

none of the above

Question 6

The Toyota Production System, among other things, was the birthplace for the practice of _______________.

Options:

A.

Six Sigma

B.

Automated Assembly

C.

Lean Principles

D.

Theoretical Principles

Question 7

One of the most popular measures of variability in a data set or population is ______________.

Options:

A.

Dispersion

B.

Variation

C.

Mean

D.

Standard Deviation

Question 8

Which of the following is NOT an advantage of using a median?

Options:

A.

Extreme values do not affect the median as strongly as they affect Mean

B.

A median can be calculated for qualitative descriptions

C.

Median is easy to understand

D.

Median can be calculated even for open-ended classes

Question 9

The null hypothesis should be:

Options:

A.

rejected

B.

not rejected

C.

accepted

Question 10

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 the control limits for a median chart.

Options:

A.

12.52 and 12.72

B.

12.54 and 12.70

C.

0.02 and 0.33

D.

none of the above

Question 11

A Black Belt is going to monitor the number of defects on different size samples. Which of the following control charts would be most appropriate?

Options:

A.

u

B.

np

C.

c

D.

p

Question 12

At a particular time, three components are in parallel and each has a reliability of 0.98. What is the reliability of the system?

Options:

A.

0.98

B.

0.94

C.

0.37

D.

0.26

E.

none of the above

Question 13

Voice of Customer is?

Options:

A.

A table to collect raw voices of Customers

B.

A software tool to automatically update customer feedbacks

C.

First used in Measure phase

D.

All of the above

Question 14

Which of the following describes the 95% confidence interval of a 20% absentee rate in a department with 30 people?

Options:

A.

6% to 34%

B.

8% to 32%

C.

13% to 27%

D.

17% to 23%

Question 15

A process using a p-chart has pbar = 0.076 and nbar = 4.86. Find the control limits.

Options:

A.

0.069 and 0.083

B.

0.072 and 0.080

C.

0.040 and 0.112

D.

0.0756 and 0.0764

E.

none of the above

Question 16

Dr. Joseph M. Juran:

Options:

A.

lectured in Japan after World War II

B.

was an author of several books in the US

C.

lectured widely in the US

D.

is considered an expert is the quality field

E.

all of the above

F.

none of the above

Question 17

A newspaper article describes a high positive correlation between obesity and orange juice consumption among six-year-olds. Parents who restrict the use of orange juice for their children have:

Options:

A.

made a type I error

B.

made a type II error

C.

misunderstood margin of error

D.

confused correlation with causation

Question 18

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 19

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

Options:

A.

miss interactions

B.

gain efficiencies

C.

save time

D.

cost less

Question 20

Which of the following is not a Measure of Central Tendency?

Options:

A.

Geometric Mean

B.

Median

C.

Mode

D.

Arithmetic Mean

Question 21

The word takt is closest to the theory of constraints word:

Options:

A.

drum

B.

buffer

C.

rope

D.

constraint

Question 22

Poka-yoke is best defined as

Options:

A.

improving machine efficiency

B.

reducing field failures to virtually zero

C.

capturing the voice of the customer

D.

preventing controllable defects

Question 23

Calculate the main effect of factor A:

Options:

A.

20

B.

25

C.

30

D.

40

E.

none of the above

Question 24

The purpose of using control charts is to

Options:

A.

determine if the process is performing within specifications

B.

evaluate process performance over time

C.

determine how to recreate the process

D.

detect the causes of nonconformities

Question 25

If item A is more likely to be detected than item B which will have the highest Occurrence value?

Options:

A.

item A

B.

item B

C.

cannot be determined

Question 26

Positional, cyclical, and temporal variations are most commonly analyzed in

Options:

A.

SPC charts

B.

multi-vari charts

C.

cause and effect diagrams

D.

run charts

Question 27

A team wants to make a schedule for a project showing which tasks must be done sequentially and which may be done simultaneously. Which tool is most appropriate?

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 28

A team is investigating ways to reduce power outages. They determine that an outage can occur in only three ways: grid failure, local transformer failure or local overload. They then investigate each of these three events for possible causes, etc. They draw a diagram that “fans out” using the power outage as the handle of the fan.

These improvements are 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

F.

Activity network diagram

Question 29

A team wants a technique for determining and displaying priorities based on frequency of various defect types. 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 30

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

Options:

A.

yes

B.

no

C.

probably

Question 31

After a team has engaged in diversion activities they may need to employ a tool for conversion. Examples of such a tool are:

I. nominal group technique

II. Multivoting

III. cause and effect diagram

IV. activity network diagram

V. matrix diagrams

Options:

A.

III and IV

B.

IV and V

C.

II and III

D.

I and II

Question 32

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 33

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 a bolt.

Options:

A.

160

B.

.160

C.

.09

D.

.30

E.

none of the above

Question 34

Find the value of (7) 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 35

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 36

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

Options:

A.

46

B.

129

C.

83

D.

–46

E.

none of the above

Question 37

Find the value of (3) 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 38

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 39

When comparing two vendors’ machines it is found that a sample of 1000 parts from machine A has 23 defectives and a sample of 1300 parts from machine B has 36 defectives. Do the data indicate that machine B has a higher rate of defectives?

Options:

A.

yes

B.

no

C.

all of the above

Question 40

Deming called the technique of studying a sample to gain understanding of the distribution of a population an “enumerative study.” His main objection to these studies was:

Options:

A.

they are too difficult to perform correctly

B.

they require extensive use of computers

C.

they assume a stable distribution

D.

random samples are expensive to obtain

E.

these studies have a high probability of Type II error

Question 41

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 42

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 43

Intuitively, which factor A or B seems most likely to be significant?

Options:

A.

A

B.

B

C.

C

D.

neither

E.

both about equally significant

Question 44

If the probability that event A occurs is 0.51, the probability that event B occurs is 0.64 and events A and B are statistically independent then:

Options:

A.

A and B are mutually exclusive

B.

the probability that both A and B occur is 0.3264

C.

A and B can’t both occur

D.

the probability that A occurs is 1-(probability that B occurs)

E.

A and B have different standard deviations

Question 45

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 mean of approximately:

Options:

A.

42

B.

42/6

C.

42/15

D.

42/ 15

E.

none of the above

Question 46

A team wants a technique for obtaining a large number of possible reasons for excess variation in a dimension. 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 47

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 48

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 49

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 50

Find Cp and Cpk.

Options:

A.

1.21 and .85

B.

.85 and 1.21

C.

.35 and .63

D.

.63 and .42

E.

none of the above

Question 51

(Refer to the previous problem) The variance of the five replications for each run is calculated. Most of these variances are approximately equal but two are significantly lower than the others. The experimenters would be especially interested in those two runs if they want to optimize:

Options:

A.

dissolution time

B.

interactions

C.

main effects

D.

robustness

E.

degrees of freedom

Question 52

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 size 3/4.

Options:

A.

.85

B.

.185

C.

.03

D.

.11

E.

none of the above

Question 53

Calculate the interaction effect.

Options:

A.

1.5

B.

205

C.

–5

D.

17

E.

–17

Demo: 53 questions
Total 227 questions