Six Sigma Black Belt Certification

Study Guide

1. For a normal distribution, two standard deviations on each side of the mean would include what percentage of the total population?
   
   1. 47%
   2. 68%
   3. 95%
   4. 99%


2. Which of the following is most important in evaluating and understanding design intent?
   
   1. Identifying the functional requirement
   2. Brainstorming failure modes
   3. Conducting computer simulations
   4. Developing FMEA
      
      
3. For consumer products, an increase in the percentage of returned goods most likely equates to an increase in
   
   1. product not meeting specifications
   2. end-user dissatisfaction
   3. internal reject rates
   4. nonconforming material costs
      
      
4. In measurement system analysis, which of the following pairs of data measures is used to determine total variance?
   
   1. Process variance and reproducibility
   2. Noise system and repeatability
   3. Measurement variance and process variance
   4. System variance and bias
      
      
5. All of the following are effective when a team leader is giving feedback to the team EXCEPT
   
   1. describing the behavior in context
   2. describing the reasons for giving feedback
   3. giving feedback when it is convenient
   4. providing actionable guidance
      
      
6. Process data being used in the initial set-up of a process are assumed to have a normal distribution. If the nominal (target) is set at the center of the distribution, and the specification limits are set at ± 3 from the center, the Cpk is equal to
   
   1. -0.25
   2.   1.00
   3.   1.33
   4.   1.67
      
      
7. A green belt is going to monitor the number of defects on different size samples. Which of the following control charts would be most appropriate?
   
   1. u
   2. np
   3. c
   4. p
      
      
8. Compared to a two-level factorial experiment, which of the following is an advantage of an experiment in three levels?
   
   1. Interaction effects can be estimated.
   2. Curvature can be characterized.
   3. The design can be augmented.
   4. Efficiency is maximized in the experimental effort.
      
      
9. Which of the following is the best technique for improving the precision of a designed experiment when the experimental material is NOT homogeneous?
   
   1. Blocking
   2. Confounding
   3. Randomization
   4. Fractionalizing
      
      
10. Which of the following most influences consumer perception of quality?
    
    1. Industry standards
    2. Company financial performance
    3. Audit results
    4. Service and repair policies
       
       
11. Correction, over-production, inventory, and motion are all examples of
    
    1. waste
    2. 5S target areas
    3. noise
    4. value-added activities
       
       
12. The primary factor in the successful implementation of six sigma is to have
    
    1. the necessary resources
    2. the support/leadership of top management
    3. explicit customer requirements
    4. a comprehensive training program
       
       
13. All of the following experimental designs could be used to investigate interactions EXCEPT
    
    1. half-fraction
    2. half-fraction with replication
    3. full-factorial with replication
    4. saturated screening with replication
       
       
14. The most important aspect of functional requirements is that they
    
    1. describe a single, measurable performance
    2. describe how a product or service should operate
    3. be traceable to the voice of the customer
    4. provide upper and lower performance limits
       
       
15. Which of the following types of variation is LEAST likely to occur in sequential repetitions of a process over a short period of time?
    
    1. Cyclical
    2. Positional
    3. Temporal
    4. Seasonal
       
       
16. The primary reason that most companies implement six sigma is to
    
    1. reduce defects
    2. improve processes
    3. improve profit
    4. increase customer satisfaction
       
       
17. According to Deming, which of the following is NOT a key element of quality leadership?
    
    1. Establishment of an organizational goal to meet or exceed customer needs
    2. The use of displays and awards to promote employee motivation
    3. Continual education and training that elevate the level of technical and professional expertise
    4. Elimination of barriers and distrust to create an organizational culture that fosters teamwork
       
       
18. What is the standard deviation of a process that operates to an exponential distribution with a mean of 25 units?
    
    1. 0.4
    2. 5.0
    3. 12.5
    4. 25.0
       
       
19. The term used to describe the risk of a Type I error in a test of hypotheses is
    
    1. power
    2. confidence level
    3. level of significance
    4. beta risk
       
       
20. Which of the following techniques can be used in regression analysis to reduce higher-order terms in the model?
    
    1. Large samples
    2. Dummy variables
    3. Transformations
    4. Blocking
       
       
21. Which of the following tools has the highest resolution?
    
    1. A feeler gage
    2. A gage block
    3. A caliper
    4. A micrometer
       
       
22. Which of the following best describes internal failure costs?
    
    1. The economic costs associated with a catastrophic failure of an internal subsystem
    2. The unavoidable quality system costs associated with the production of any product or service
    3. The opposite of external failure costs
    4. The costs resulting from a nonconformance detected before a product or service is provided
       
       
23. In order for a problem to be solved correctly, which of the following must occur first?
    
    1. The problem must be defined.
    2. Relevant data must be gathered.
    3. The measurement system must be validated.
    4. The process must be mapped.
       
       
24. One characteristic of attributes data is that it is always
    
    1. continuous
    2. discrete
    3. expensive to collect
    4. read from a scale of measurement
       

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