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ICBB IASSC Lean Six Sigma - Black Belt Questions and Answers

Questions 4

The two types of data that are to be used in Statistical Analysis are Attribute and Variance.

Options:

A.

True

B.

False

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Questions 5

Range Charts are the technique used to determine if ______________ are occurring within the subgroups of the SPC Charts.

Options:

A.

Common Causes

B.

Special inspections

C.

Unnatural forces

D.

Special Causes

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Questions 6

Questions that can be best answered by a Visual Factory include all of these except _____________________.

Options:

A.

Are setups optimized for lower scrap levels?

B.

Can extra inventory be seen easily?

C.

Can changeover challenges be recognized?

D.

Are unneeded tools or supplies easily noted?

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Questions 7

For the data shown here which statement(s) are true? (Note: There are 2 correct answers).

ICBB Question 7

Options:

A.

With 95% confidence, we cannot conclude if the samples are from three Normal Distributions

B.

With greater than 95% confidence, we conclude the samples are from Non-normal Distributions

C.

If we wanted to compare the Central Tendencies of these three samples we would use the one way ANOVA test

D.

If we wanted to compare the Central Tendencies of these three samples we could use Mood’s Median test

E.

If we wanted to compare the Central Tendencies of all three samples we could use the Mann-Whitney test

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Questions 8

When variation is removed from the output of a process then the process customer can have more confidence in the experience that results from the process.

Options:

A.

True

B.

False

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Questions 9

Of the various types of data shown below which is NOT representative of Variable Data.

Options:

A.

Length of a table

B.

Liters of solution added to a formula

C.

Number of employees wearing a uniform

D.

Miles per hour of a vehicle

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Questions 10

Questions that can be best answered by a Visual Factory include all of these except _____________________.

Options:

A.

Are downtime issues easily noted?

B.

Can extra inventory be seen easily?

C.

Are unneeded tools or supplies easily noted?

D.

Are setups optimized for lower scrap levels?

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Questions 11

Appropriate measures means that measurements are ______________.

Options:

A.

Representative

B.

Sufficient

C.

Contextual

D.

Relevant

E.

All of these answers are correct

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Questions 12

Which of these graphs demonstrates conditions which would be sufficient to enable OCAP for the process? 

Options:

A.

Xbar Chart

B.

Time Series Chart

C.

Neither

D.

Both

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Questions 13

The two types of data that can be used in Statistical Analysis are Attribute and Variable.

Options:

A.

True

B.

False

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Questions 14

When a Belt properly analyzes the results of an experiment he must examine the Residuals in expectation of finding all of the following except _________.

Options:

A.

Some Residuals higher than others

B.

Residuals will represent a Linear Regression

C.

All Residuals within 2 Standard Deviations of the Mean

D.

Some Residuals lower than others

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Questions 15

Accuracy can be assessed in several ways and a fairly accurate means of measurement is visual comparison.

Options:

A.

True

B.

False

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Questions 16

Fractional Factorial Designs are used to analyze factors to model the output as a function of inputs if Hypothesis Testing in the Analyze Phase was inadequate to sufficiently narrow the factors that significantly impact the output(s).

Options:

A.

True

B.

False

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Questions 17

A valid Multiple Linear Regression (MLR) is characterized by all of these except?

Options:

A.

It is an assumption that the X’s (inputs) are not correlated to each other

B.

The X’s (inputs) are assumed to be independent of each other

C.

The Residuals from MLR analysis have to be Normally Distributed

D.

MLR is conducted based on a deliberate form of experimentation

E.

It is not possible to evaluate interactions in a MLR analysis

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Questions 18

Use this data to calculate the Z score. Average oF. 65, Standard Deviation: 3, Upper Spec Limit: 72

Options:

A.

0.27

B.

1.5

C.

2.33

D.

4.12

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Questions 19

An operator is measuring the distance between two points. Which is most likely to be influenced by the operator?

Options:

A.

Precision of the measurement

B.

Accuracy of the measurement

C.

Calibration of the instrument

D.

All of these answers are correct

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Questions 20

When a Belt creates a Process Map she will use a __________________ to depict a decision point requiring a Yes or No decision.

Options:

A.

Circle

B.

Square

C.

Diamond

D.

Rectangle

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Questions 21

From the variance F-test shown above, which of these conclusions is/are valid?

ICBB Question 21

Options:

A.

The variance between the class score distribution is significantly different

B.

The variance between the class score distribution is not significantly different

C.

This test applies only to Normal Distributed data at 99 % confidence

D.

This test applies only to Non-normal Data at 99 % confidence

E.

There are not enough data points to make any statistical conclusions

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Questions 22

When a Belt implements an improvement that is automated thus requiring no particular understanding for use he has applied which Lean tool?

Options:

A.

Mistake Proofing

B.

Kaizen Event

C.

5S

D.

None

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Questions 23

If a Six Sigma project was to reduce changeover times and the team found the project success was decreasing over time since changeover times began to creep back up, which Lean tools should be considered in the Control Phase to reestablish and sustain the project success?

Options:

A.

Improve the lighting to assure adequate visibility

B.

Confirm a Visual Factory exists to assure proper communication of status of machines

C.

Implement Kanbans to assure enough inventory for the process step

D.

Reword the standardized work instructions to use active verbs and not passive phrases

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Questions 24

A Factorial Experiment based on a Level 2 Design with 4 factors would require 16 runs to fully assess the interactions.

Options:

A.

True

B.

False

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Questions 25

With Measurement System Analysis we are concerned with two issues that impact the potential variability of the data. They are _____________________.

Options:

A.

Precision and Accuracy

B.

Reliability and Repeatability

C.

Error and Spread

D.

Sensitivity and Deflection

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Questions 26

A Belt working in a supply chain environment has to make a decision to change suppliers of critical raw materials for a new product upgrade. The purchasing manager is depending on the Belt’s effort requiring that the average cost of an internal critical raw material component be less than or equal to $4,200 in order to stay within budget. Using a sample of 35 first article components, a Mean of the new product upgrade price of $4,060, and a Standard Deviation of $98 was estimated. Select the answer that best states the Practical Problem.

Options:

A.

If the average cost per component is $4,200 or less, then the purchase manager will introduce the new product upgrade with new components

B.

If the average cost per component is greater than $4,200, then the purchase manager will introduce the new product upgrade with new components

C.

Only if the average cost per product upgrade is $4,060, will the purchase manager introduce new product upgrades with new components

D.

If the average cost per new product upgrade is less than $180, then the purchase manager will introduce the new product upgrade with new components

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Questions 27

Kanban establishes a means of monitoring production, conveyance and delivery information such that efficient flow is established. The method used by Kanban is to require a _________ before anything moves.

Options:

A.

Sign-off

B.

Signal

C.

Bell to ring

D.

Work order

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Questions 28

Which statement is most correct for the Regression Analysis shown here?

ICBB Question 28

Options:

A.

The Regression explains 50.8% of the process variation

B.

The air-fuel ratio explains most of the TurbineOutput variation

C.

This Simple Linear Regression explains 98+% of the process variation

D.

This Multiple Linear Regression has four statistically significant independent variables

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Questions 29

Which statement(s) are correct about the Pareto Chart shown here for the DOE analysis? (Note: There are 2 correct answers).

ICBB Question 29

Options:

A.

It is unknown from this graph how many factors were in the Experimental Design

B.

The factors to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 2.06

C.

The effects to keep in the mathematical model are E, D, DE, BD and B with an alpha risk equal to 0.05

D.

The factors to keep in the mathematical model with a 5% alpha risk are BE, AB, A and AD

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Questions 30

Using this data calculate the percentage of DPU.

Data: 763 defects, 18,000 units.

Options:

A.

2.12

B.

3.42

C.

4.24

D.

5.72

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Questions 31

Which of the items listed do not define what an X-Y Diagram is?

Options:

A.

Created for every project

B.

Based on team's collective opinions

C.

Updated whenever a parameter is changed

D.

Used to show each step in a process

E.

A living document throughout project lifecycle

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Questions 32

A Belt is analyzing data and upon creation of the graphical analysis sees multiple modes. One of the primary reasons this could occur is because the process has experienced a ____________________.

Options:

A.

Significant change from one shift to another

B.

Sizable Measurement System error

C.

Catastrophic failure of some sort

D.

Any one of these

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Questions 33

If a Belt needed to model the data for the number of weaves in section of carpet fabric she would use the _____________ Distribution approach.

Options:

A.

Poisson

B.

Extended

C.

Exponential

D.

Weibull

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Questions 34

The most appropriate type of FMEA for a product before going into manufacturing is a ___________ FMEA.

Options:

A.

Design

B.

Consumer

C.

Survey

D.

Test Process

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Questions 35

The reported Cpk for a process with an average of 104 units, a spread of 18 units and upper and lower specification limits of 122 and 96 units would be?

Options:

A.

0.5

B.

0.89

C.

1.00

D.

2.00

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Questions 36

Assessing process proportion as opposed to evaluating a process with respect to a set target can be done using which of these?

Options:

A.

Process proportion equals some value range

B.

Process proportion equals some desired value

C.

Target is current

D.

Proportion of the tail is equal

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Questions 37

The class score distribution of schools in a metropolitan area is shown here along with an analysis output. Comment on the statistical significance between the Means of the two distributions. Select the most appropriate statement.

ICBB Question 37

Options:

A.

The two class Means are statistically different from each other

B.

The two class Means statistically not different from each other

C.

Inadequate information on class Means to make any statistical conclusions

D.

A visual comparison shows that class Means are not statistically different

E.

A visual comparison shows that class Means are statistically different

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Questions 38

Which statement(s) are incorrect about Fractional Factorial Designs?

Options:

A.

A Half Fractional Design for 5 factors has the same number of experimental runs as a Full Factorial Design for 4 factors assuming no repeats or replicates or Center Points

B.

Quarter Fractional experiments can exist for those with 4 factors

C.

Resolution V design is desired while controlling costs of experimentation

D.

Half Fractional experiments do not exist for those designs with only 2 factors

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Questions 39

When the Inputs, X’s, for your process are Normally Distributed about the Mean, the Outputs, Y’s, will be Normally Distributed.

Options:

A.

True

B.

False

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Questions 40

What is the Ppk of a process with a spread of 24 units, an average of 68, an upper limit of 82 and a lower limit of 54?

Options:

A.

1.68

B.

2.00

C.

4.00

D.

4.42

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Questions 41

One of the foundations of Lean Six Sigma is the concept that the output of a process (Y) is influenced by the process inputs (X’s) and is commonly shown as which formula?

Options:

A.

Y = Z(X2)

B.

Y = f(X3)

C.

Y = f(Xn)

D.

Y = g(X+ 1.5)

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Questions 42

Relative to a Design of Experiments the term Collinear refers to variables being a ________________ of each other.

Options:

A.

Linear combination

B.

Directly parallel

C.

Mirror image

D.

None of the above

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Questions 43

For the data shown here which statement(s) are true? (Note: There are 2 correct answers).

ICBB Question 43

Options:

A.

With 95% confidence, we cannot conclude if the samples are from three Normal Distributions.

B.

With greater than 95% confidence, we conclude the samples are from Non-normal Distributions.

C.

If we wanted to compare the Central Tendencies of these three samples we would use the one way ANOVA test.

D.

If we wanted to compare the Central Tendencies of these three samples we could use Mood’s Median test.

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Questions 44

From the variance F-test shown above, which of these conclusions is/are valid?

ICBB Question 44

Options:

A.

The variance between the class score distribution is not significantly different

B.

This test applies only to Normal Distributed data at 99 % confidence

C.

The variance between the class score distribution is significantly different

D.

There are not enough data points to make any statistical conclusions

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Questions 45

The Control Limits width varies if the sample size varies for which type of chart?

Options:

A.

P Charts

B.

NP Charts

C.

Xbar-R Charts

D.

Time Series Charts

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Exam Code: ICBB
Exam Name: IASSC Lean Six Sigma - Black Belt
Last Update: Dec 4, 2024
Questions: 300

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