IASSC Certified Lean Six Sigma Black Belt (ICBB) Free Practice Test

Question 1

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

A. Machines continually operating to reduce the labor cost per piece

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

C. Changeover instructions incomplete

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

Correct Answer: A

Question 2

Control Charts were developed by Dr. Shewhart to track data over time. To detect Special Cause variation the Control Charts use which of these?

A. None of the above

B. Center Line and Control Limits

C. Outlier analysis methods

D. Data shift analysis

Correct Answer: B

Question 3

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

A. False

B. True

Correct Answer: A

Question 4

Following process modifications, the Null Hypothesis states that no improvement to the process has occurred. If we discover the Null Hypothesis Test was rejected when it was false that would be a(n) ________________________.

A. Type I Error

B. Alpha Error

C. Type III Error

D. Type II Error

Correct Answer: D

Question 5

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.

A. A visual comparison shows that class Means are statistically different

B. The two class Means are statistically different from each other

C. The two class Means statistically not different from each other

D. Inadequate information on class Means to make any statistical conclusions

E. A visual comparison shows that class Means are not statistically different

Correct Answer: B

Question 6

To be an effective Lean Six Sigma practitioner one must understand the difference between ___________________________.

A. Practical and Statistical significance

B. ANOVA and the Analysis of Variance

C. F-test and test of variances of 2 samples

D. Nonparametric tests and tests of Non-normal Data

Correct Answer: A

Question 7

Which one of these tools is frequently used to help drill down to possible causes once a Fishbone Diagram is constructed?

A. Skeleton Diagnostic

B. 5 Why Analysis

C. 3 When Analysis

D. Ishikawa Diagram

Correct Answer: B

Question 8

Which statements are correct about the advanced Capability Analysis shown here?

(Note: There are 3 correct answers).

A. This is a Poisson Capability Analysis.

B. The DPU does not seem to vary depending on sample size.

C. The maximum DPU in one observation was nearly 0.0753.

D. The average DPU with 95% confidence is between 0.024 and 0.0295.

E. The process shows only one instance of being out of control statistically so we have confidence in the estimated DPU of this process.

Correct Answer: B,C,D

Question 9

Use this data to calculate the Z Score. Average of: 92, Standard Deviation: 2, Upper Spec Limit: 101

A. 4.50

B. 2.25

C. 1.5

D. 0.75

Correct Answer: A

Question 10

"A calculated time frame that matches customer demand" is a definition of what Lean Principles term?

A. Takt time

B. Kaizen event

C. Value Stream

D. Kanban

Correct Answer: A

Question 11

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 _____________.

A. Twice the Standard Deviation

B. All evenly divisible by 3

C. Within 10% of each other

D. The same number

Correct Answer: D

Question 12

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).

A. False

B. True

Correct Answer: B

Question 13

Measurement __________ is defined as the difference between the observed and the expected values for a given set of data.

A. Range

B. Breadth

C. Bias

D. Linearity

Correct Answer: C

Question 14

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?

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

B. Improve the lighting to assure adequate visibility

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

D. Implement Kanbans to assure enough inventory for the process step

Correct Answer: C

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IASSC Certified Lean Six Sigma Black Belt (ICBB) Free Practice Test