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IASSC Lean Six Sigma – Black Belt Question and Answers

IASSC Lean Six Sigma – Black Belt

Last Update May 18, 2024
Total Questions : 300

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Questions 1

The Central Limit Theorem says that as the sample size becomes large the sample Mean distribution will form a Normal Distribution, ____________________.

Options:

A.  

If the Measurement System is properly calibrated

B.  

When the data is collected accurately

C.  

If the shape is evenly spread

D.  

No matter what the shape of the population distribution of individuals

Discussion 0
Questions 2

Handling of warranty returns, process improvement team meetings and rework to meet customer expectations are all examples of business costs that are classified as ___________ .

Options:

A.  

Nuisance

B.  

Non-value Add

C.  

Necessary

D.  

Unavoidable

Discussion 0
Questions 3

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

Discussion 0
Questions 4

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

Options:

A.  

Child’s height is 4 foot 3 inches

B.  

Three employees wore hard hats

C.  

Car burned 2.7 gallons of gasoline

D.  

Train was going 140 kilometers per hour

Discussion 0
Questions 5

How many experimental runs exist in a Full Factorial and fully randomized design for 5 factors with 2 replicates for the Corner Points and no Center Points? The factors in the experiment are only at 2-levels.

Options:

A.  

10

B.  

128

C.  

256

D.  

64

Discussion 0
Questions 6

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

Discussion 0
Questions 7

A valid mathematical Regression represents all of the characteristics shown except _________________.

Options:

A.  

All of the standardized residuals will be within ±3 Standard Deviations

B.  

The sum of the residuals is zero

C.  

The residuals when plotted follow a Normal Distribution

D.  

Most standardized residuals are within ±2 Standard Deviations

E.  

The Residual is equal to the difference between the observed and predicted values

Discussion 0
Questions 8

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

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

Discussion 0
Questions 9

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

Discussion 0
Questions 10

Sally bought a blender from her local appliance store. When she changed blades the blender would not function. For the manufacturer this would be categorized as what type of cost?

Options:

A.  

Internal Failure Costs

B.  

External Failure Costs

C.  

Prevention Costs

D.  

Appraisal Costs

Discussion 0
Questions 11

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

Discussion 0
Questions 12

A Full Factorial experiment using a 3 level 3 factor approach has been proposed to test the viability of an extrusion machine experiment. How many treatment combinations will this approach involve?

Options:

A.  

6

B.  

9

C.  

27

D.  

54

Discussion 0
Questions 13

For her injection molding project a Belt needed to track the percentage of defectives of a particular sample set so she used a ___________ to display the data?

Options:

A.  

Individual Chart

B.  

C Chart

C.  

Xbar Chart

D.  

P Chart

Discussion 0
Questions 14

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. The Alternative Hypothesis in the above example is?

Options:

A.  

The Standard Deviation is equal to $300

B.  

The Mean is less than $4,320

C.  

The Mean is equal to $4,060

D.  

The Mean is less than $4,200

E.  

The Mean is greater than $ 4,200

Discussion 0
Questions 15

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

Discussion 0
Questions 16

One of the primary deliverables from performing a SIPOC is to begin to understand which outputs have the greatest affect on the customer most valued inputs.

Options:

A.  

True

B.  

False

Discussion 0
Questions 17

Which of these is not a primary cause for Non-normal Data?

Options:

A.  

Skewness

B.  

Mixed Distributions

C.  

Kurtosis

D.  

Formulosis

E.  

Granularity

Discussion 0
Questions 18

The _____________ Distribution would be the most desirable for modeling the number of stitch defects in a portion of fabric.

Options:

A.  

Exponential

B.  

Extended

C.  

Poisson

D.  

Weibull

Discussion 0
Questions 19

The Normal Distribution is considered to be the most important distribution in statistics and, among other things is defined as having a total area under the curve of 1, is mounded and symmetrical and the Mean, Median and Mode are _____________.

Options:

A.  

All evenly divisible by 3

B.  

Twice the Standard Deviation

C.  

Within 10% of each other

D.  

The same number

Discussion 0
Questions 20

In a good Measurement System the most variation will be with part-to-part measurements. What should you do if the majority of variation is associated with the Gage R&R assuming the gage is technically capable?

Options:

A.  

Focus on fixing the Repeatability and Reproducibility of the measurement device

B.  

Purchase a new machine

C.  

Focus on trimming the Part-to-Part variation

D.  

Run another MSA test with the machine

Discussion 0
Questions 21

A ___________ is used primarily to track the stability of the average value of a metric of interest.

Options:

A.  

NP Chart

B.  

Xbar-R Chart

C.  

I-MR Chart

D.  

C Chart

Discussion 0
Questions 22

Using this partial Z Table, how many units from a month’s production run are expected to not satisfy customer requirements for the following process?

Upper specification limit: 7.2 Lower specification limit: 4.3 Mean of the process: 5.9 Standard Deviation: 0.65 Monthly production: 450 units

Options:

A.  

3

B.  

7

C.  

10

D.  

12

Discussion 0
Questions 23

For a Normal Distribution as samples size increases the Range in Mean and Standard Deviation decrease relative to the Mean and Standard Deviation of the population.

Options:

A.  

True

B.  

False

Discussion 0
Questions 24

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. In order to increase the Long Term Z value to 4, what is the maximum long term variation in pricing the Belt can accept for his upgraded critical raw material component?

Options:

A.  

$20

B.  

$35

C.  

$70

D.  

$110

Discussion 0
Questions 25

Some of the sources for different types of error that can be quantified using Statistical Analysis are ___________________.

Options:

A.  

Error in sampling

B.  

Bias in sampling

C.  

Error in measurement

D.  

All of these answers are correct

Discussion 0
Questions 26

Two of the key deliverables for the Measure Phase are a robust description of the process and its flow and an assessment of the Measurement System.

Options:

A.  

True

B.  

False

Discussion 0
Questions 27

A statistical test or Hypothesis Test is performed to reject or fail to reject a stated hypothesis and it converts the Practical Problem into a Statistical Problem.

Options:

A.  

True

B.  

False

Discussion 0
Questions 28

Fractional Factorial designs are used to reduce the ____________ because the number of runs has been lowered.

Options:

A.  

Time and cost of experiments

B.  

Number of people involved

C.  

Number of data measurement points

D.  

Output summary

Discussion 0
Questions 29

As a means of measuring the effects on other areas of a process as a result of changes in the primary metric we also define and track ________________.

Options:

A.  

Parallel process metrics

B.  

Secondary metrics

C.  

Tertiary metrics

D.  

Industry standards

Discussion 0
Questions 30

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

Discussion 0
Questions 31

It would be more likely than not for a Belt conducting a Regression Analysis to find that the _______________________.

Options:

A.  

r2 value is smaller than the absolute value of r

B.  

Correlation Coefficient equals r2

C.  

Coefficient of Determination is less than r2

D.  

Correlation Coefficient equals r divided by 2

Discussion 0
Questions 32

A Lean Six Sigma project is attempting to reduce inventory days. The Process Capability will be monitored as part of the Control Phase to track the sustainability of the improvement.

Which distribution type is best used for performing the Capability Analysis?

Options:

A.  

Weibull Distribution

B.  

Normal Distribution

C.  

Exponential Distribution

D.  

Logistic Distribution

E.  

Gaussian Distribution

Discussion 0
Questions 33

Situations where standardized work needs to be incorporated include all of these except _____________________.

Options:

A.  

Machines continually operating to reduce the labor cost per piece

B.  

Lack of a system to assure proper inventory levels at repair stations

C.  

Changeover instructions incomplete

D.  

Process flow for the same product assembly taking various cycle time for completion

Discussion 0
Questions 34

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

Discussion 0
Questions 35

Cost of Poor Quality (COPQ) can be classified as Visible Costs and Hidden Costs. Which of these items is a Visible Cost?

Options:

A.  

Lost Customer Loyalty

B.  

Time Value of Money

C.  

Returns

D.  

Late Delivery

Discussion 0
Questions 36

Early in a project a Belt will want to begin to identify and evaluate risk factors for the subject process and will therefore begin building a(n) ________.

Options:

A.  

FMEA

B.  

SIPOC

C.  

X-Y Diagram

D.  

Team Charter

Discussion 0
Questions 37

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

Discussion 0
Questions 38

Much of the Six Sigma methodology is used to identify and remove causes for _____________ .

Options:

A.  

Process Variation

B.  

Material Costs

C.  

Excess Inventory

D.  

Lost Sales

Discussion 0
Questions 39

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

Options:

A.  

Mirror Image

B.  

Directly Parallel

C.  

Collinear

D.  

None of the above

Discussion 0
Questions 40

When conducting a Hypothesis Test using Continuous Data the proper sample size is influenced only by the extent to which we need to assess a Difference to be detected but not the inherent variation in the process.

Options:

A.  

True

B.  

False

Discussion 0
Questions 41

When we compare short-term and long-term Capability which of these is true?

Options:

A.  

Cp is better for the short term

B.  

Both short-term and long-term performance are alike

C.  

Performance tends to improve over time

D.  

Cp is better for the long-term

Discussion 0
Questions 42

On a _________________ one can see a pattern from the graphed points such that conclusions can be drawn about the largest family of Variation.

Options:

A.  

Multi-Vari Chart

B.  

Weighted Scale

C.  

X-Y Matrix

D.  

Poisson Chart

Discussion 0
Questions 43

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

Discussion 0
Questions 44

The _______ is the most frequently occurring value in a distribution of data.

Options:

A.  

Median

B.  

Mean

C.  

Mode

D.  

Center Point

Discussion 0
Questions 45

A ___________ is used primarily to track the stability of the average value of a metric of interest.

Options:

A.  

NP Chart

B.  

Xbar-R Chart

C.  

I-MR Chart

D.  

C Chart

Discussion 0