# IASSC ICBB IASSC Lean Six Sigma – Black Belt Exam Practice Test

Demo: 45 questions
Total 300 questions

## IASSC Lean Six Sigma – Black Belt Questions and Answers

Question 1

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

#### Options:

A.

True

B.

False

Question 2

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

Question 3

Sally and Sara sell flower pots at their garage sale. Martha motivates Rose mentioning that they will sell a minimum of 16 pots per day if the outside temperature exceeds 60o F. From a sample, whose population is assumed to follow a Normal Distribution, taken for 30 days at 60 degrees or more an average of 15.2 pots per day were sold with a Standard Deviation of 0.6 pots. What is the Z value for this sales process?

#### Options:

A.

0.67

B.

1.13

C.

1.33

D.

2.66

Question 4

Using this data calculate the percentage of DPU.

#### Options:

A.

2.74

B.

3.23

C.

4.56

D.

5.93

Question 5

Sally and Sara sell flower pots at their garage sale. Sally motivates Sara mentioning that they will sell a minimum of 15 pots per day if the outside temperature exceeds 60o F. From a sample, whose population is assumed to follow a Normal Distribution, taken for 30 days at 60 degrees or more an average of 13.6 pots per day were sold with a Standard Deviation of 0.7 pots. The statistical Degrees of Freedom for this example are?

#### Options:

A.

1

B.

29

C.

30

D.

31

E.

2

Question 6

The validity of the decision made with Hypothesis Testing is dependent upon all of the following except ______________________.

#### Options:

A.

Beta risk

B.

Range of data

C.

Alpha risk

D.

Sample size

Question 7

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

Question 8

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. #### 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

Question 9

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

Question 10

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

#### Options:

A.

Changeover instructions incomplete

B.

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

C.

Machines continually operating to reduce the labor cost per piece

D.

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

Question 11

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

#### Options:

A.

Management’s desired

B.

Supplier delivered

C.

Process operator

D.

Customer most valued

Question 12

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

Question 13

A fundamental rule is that both Standard Deviation and Variance can be added.

#### Options:

A.

True

B.

False

Question 14

The method of Steepest Ascent guides you toward a target inside the original inference space.

#### Options:

A.

True

B.

False

Question 15

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

Question 16

A ___________ problem in the Measurement System suggests that there is a lack of consistency in the measurement over time.

#### Options:

A.

Linearity

B.

Bias

C.

Stability

D.

Magnitude

Question 17

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

Question 18

A Personal Trainer was assessing her workout class participants for their body fat content and had to include data for her analysis. One of the columns listed the range of weight of the people included in the studies. This required plotting a Histogram of the weight of the people assessed for their body fat content. While drawing the Histogram the x-axis contained a certain scale of data. Pick the scale of data that is appropriate for Histograms.

#### Options:

A.

Ordinal Scale Data

B.

Ration Scale Data

C.

Nominal Scale Data

D.

Interval Scale Data

Question 19

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.

D.

Sensitivity and Deflection

Question 20

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 \$3,600 in order to stay within budget. Using a sample of 42 first article components, a Mean of the new product upgrade price of \$3,200 and a Standard Deviation of \$180 was estimated. Based on the data provided, the Z value for the data assuming a Normal Distribution is?

#### Options:

A.

1.11

B.

2.22

C.

4.30

D.

5.42

Question 21

To properly analyze the variables impacting the output of a process we need to collect data that represents at least 80% of the variation in the process and assure ourselves we are collecting data from all three types of variation which are _______________.

#### Options:

A.

Within, Between and Temporal

B.

Within, Between and Temporary

C.

Without, Above and Below

D.

Induced, Natural and Unavoidable

Question 22

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

Question 23

When doing Hypothesis Testing on Non-normal data Belts will use a ________________ to compare more than two sample proportions to each other.

#### Options:

A.

Z score Table

B.

Sakami Table

C.

Mean-to-Mode Analysis

D.

Contingency Table

Question 24

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

Question 25

Which statement(s) are correct about the Factorial Plot shown here? (Note: There are 3 correct answers). #### Options:

A.

When the cutting speed increased from low to high level, the tool age increases

B.

The coefficient of the metal hardness is positively related to the output of tool age

C.

The coded coefficient is lower for cutting speed than the cutting angle related to the output of tool age

D.

These plots prove a statistically significance factor with 95% confidence

E.

These plots are an example of interaction plots

Question 26

Which of these graphical presentations displays the values of each individual reading?

#### Options:

A.

Histogram

B.

Box Plot

C.

Stem and Leaf Plot

D.

X-Y Diagram

Question 27

An ANOVA used across many dependent variables could increase the Beta risk.

#### Options:

A.

True

B.

False

Question 28

What conclusion is most correct about the Experimental Design shown here with the response in the far right column? #### Options:

A.

No factor has enough statistical confidence greater than 95% to have an impact on the response rate

B.

Constant, Adv and Bev are the only factors statistically affecting the response rate with 95% confidence or more

C.

If the Adv is increased from the low level to the high level, the response rate increases

D.

The response level is statistically concluded to only need the Adv and Bev factors set at the low level to get the largest response rate

E.

This design does not have enough experimental runs to conclude anything as evidenced by the lack of P-values in the MINITABTM output

Question 29

Following the completion of a LSS project the Belt not only creates a Control Plan he also develops a _____________ so those involved in the process know what to do when the critical metrics move out of spec.

#### Options:

A.

Response Plan

B.

Call List

C.

Chain-of-Command

D.

Defect Analysis Plan

Question 30

The Mann-Whitney test is a powerful test and is unique to situations from which of the choices listed? (Note: There are 2 correct answers).

#### Options:

A.

Testing the identity of two populations

B.

Focuses on equality of the Median of the two populations

C.

Less powerful than the traditional “t-test”

D.

More widely applicable than the traditional “t-test”

Question 31

A ___________ problem in the Measurement System suggests that there is a lack of consistency in the measurement over time.

#### Options:

A.

Linearity

B.

Bias

C.

Stability

D.

Magnitude

Question 32

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

#### Options:

A.

Histograms

B.

SPC Charts

C.

NP Charts

D.

Pareto Charts

Question 33

When one speaks of 20% of something contributing 80% of the affect they are referring to what is known as the _________________.

#### Options:

A.

Shewhart Example

B.

Pareto Principle

C.

Balance Equation

D.

Connection Principle

Question 34

A Non-parametric Test should be used if just one distribution is not Normal out of the two or more gathered.

#### Options:

A.

True

B.

False

Question 35

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

Question 36

Screening experiments are the proper choice when a Belt is faced with the situation of highly Fractional Factorial Designs.

#### Options:

A.

True

B.

False

Question 37

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.

Question 38

Calculate the Rolled Throughput Yield of this process using this data.

Data: unit input: 1215, unit output: 1180, defects repaired: 184, scrap: 42

#### Options:

A.

80.85%

B.

81.40%

C.

82.23%

D.

84.96%

Question 39

If the results from a Hypothesis Test are located in the "Region of Doubt" area, what can be concluded?

#### Options:

A.

Rejection of the Alpha

B.

We fail to reject the Null Hypothesis

C.

The test was conducted improperly

D.

We reject the Null Hypothesis

Question 40

The Waste of Overproduction is defined as ______________________.

#### Options:

A.

The unnecessary movement of people and equipment

B.

The liability of materials that are bought, invested in and not immediately sold or used

C.

Producing more than the next step needs or more than the customer buys

D.

The extra movement of material

Question 41

If a process has subgroups for Variable data and the process runs for a long period of time, then the best pair of SPC Charts to use would be an Xbar and _________.

#### Options:

A.

NP Chart

B.

Individuals Chart

C.

R Chart

D.

C Chart

Question 42

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

Question 43

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.

C.

Necessary

D.

Unavoidable

Question 44

A Non-parametric Test should be used if just one distribution is not Normal out of the two or more gathered.

#### Options:

A.

True

B.

False

Question 45

When a Belt decides to use written procedures and visual controls to improve the consistency of the tasks that must occur in the process he is improving he has utilized the _________________ activity of 5S.

#### Options:

A.

Sustaining

B.

Sorting

C.

Standardizing

D.

Straightening

Demo: 45 questions
Total 300 questions