IIBM examination papers

Examination Paper of Six Sigma Green Belt

IIBM Institute of Business Management 1

CERTIFIED SIX SIGMA GREEN BELT

EXAMINATION PAPER

Guideline for paper

• Total No. of Question is 100.

• The minimum passing marks is 40%

• Each question carries 1 mark.

• Answer all the questions.

Total: 100 Marks

1. The Following is a sample data set.

10 8 8 6 5

What is the variance of this data set?

a. 3.0

b. 3.8

c. 7.3

d. 7.4

2. An auditor should use a histogram in a quality audit to do which of the following?

a. Provide objective evidence that the audited uses statistical process control (SPC)

b. Expose patterns that are normally difficult to detect

c. Interpret data for a trend chart

d. create a stratified tally diagram

3. Comparing how a process is actually performed against the documented work instruction for that

process is an example of which of the following techniques?

a. Quantitative

b. Qualitative

c. Statistical

d. Random sampling

4. Attribute sampling should be used when

a. The data are measurements in metric units.

b. Ayes-or-no decision is to be made.

c. The population has variability.

d. A multi-stage sampling plan is needed.

5. Scatter diagrams are best described as

a. Histograms.

b. Correlation analysis.

c. Pareto analysis.

d. Ishikawa diagrams.

6. If data are plotted over time, the resulting chart will be a

a. Run chart

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IIBM Institute of Business Management 2

b. Histogram

c. Pareto chart

d. Poisson distribution

7. To determine who are or might be customers for a specific process, it would be most useful to create a

a. Pareto chart

b. Flow diagram

c. Cause and effect diagram

d. Scatter diagram

8. A production line uses signs at specific points on the line to indicate when components or raw materials

need to be replenished. The practice is an example of

a. Kanban

b. Poka-yake

c. Checkpoints

d. Hoshin

9. Which of the following is a good tool for planning cycle time reduction and concurrent operations?

a. A timeline

b. A Pareto diagram

c. An X and R chart

d. A PERT chart

10. Attribute and variable data are best described as which of the following? Attribute variable

a. Counted values measured values

b. Counted values visual features

c. Measured values counted values

d. Visual features counted values

11. All of the following are common ways for people to react to conflict EXCEPT

a. Competing

b. Collaborating

c. Avoiding

d. Sabotaging

12. A quality manager has chosen to survey customer satisfaction by talking samples based on the

categories of frequency of use, categories of use, and demographic. This technique is known as

a. Random sampling

b. Data collection

c. Stratification

d. Customer classification

13. Which of the following actions is Not used to reduce process cycle time?

a. Analyzing current processes

b. Reducing queue times

c. Setting priorities

d. Implementing activity-based costing

14. A company’s accounts payable department is trying to reduce the time between receipt and payment

of invoices and has recently completed a flowchart. Which of the following tools would be the for them to

use next?

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IIBM Institute of Business Management 3

a. Fishbone diagram

b. Scatter diagram

c. Box and whisker plat

d. Histogram

15. In a manufacturing company, the machine shop is what kind of customer in relation to the human

resource department?

a. Intermediate

b. Hidden

c. External

d. Internal

16. The primary purpose of a project charter is to

a. Subdivide the project into smaller, more manageable components

b. Provide management with a tool for selecting a project that addresses business needs

c. Provide management with a tool to ensure that project deadlines are met

d. Provide the project manager with authority to apply organizational resources to project activities

17. Sample selection of parts for inspection must be selected at random to ensure

a. A minimum sample size.

b. The probability of not rejecting the lot

c. The probability of accepting the lot

d. Finding typical characteristics of the lot.

18. Which of the following are bases for establishing calibration intervals?

I. Stability

II.Purpose

III.Degree of usage

a. I and II only

b. I and III only

c. II and III only

d. I, II, and III

19. Specification limits are derived from which of the following?

a. Process capability studies

b. Process control charts

c. Customer requirements

d. Historical data

20. The primary purpose of a control chart is to

a. Set Specifications and tolerances

b. compare operations.

c. Determine the stability of a process.

d. Accept or reject a lot of material

21. When a control chart is used on a new process, capability can be assessed at which of the following

times?

a. Before the chart is first started

b. After the first ten points are plotted

c. When the plotted points hug the centerline

d. After the process is shown to be in control

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IIBM Institute of Business Management 4

22. Precision is best described as

a. A comparison to a known standard

b. The achievement of expected outgoing quality

c. The repeated consistency of results

d. The difference between an average measurement and the actual value

23. The overall ability of two or more operators to obtain Consistent results repeatedly when measuring

the same set of parts and using the same measuring equipment is the definition of

a. Repeatability

b. Precision

c. Reproducibility

d. Accuracy

24. Which of the following conditions must be met for a process to be in a state of statistical control?

a. Most of the product out by the process is in specification.

b. All subgroup averages and rang are within control limits.

c. All variation has been completely removed

d. Previously optimal process settings are used.

25. Which of the following measures of dispersion is equal to the sum of deviations from the mean

squared divided by the sample size?

a. Range

b. Standard deviation

c. Variance

d. Mode

26. An X and R chart is used to

a. Indicate process variation

b. Specify design Limits

c. Interpret costs

d. Identify customer expectations

27. Which of the following is the most useful graphical tool for promoting an understanding of process

capability?

a. A flowchart

b. a histogram

c. An affinity diagram

d. An Ishikawa diagram

28. The type of chart that presents the value of items in descending order is a

a. Histogram

b. Pareto chart

c. U chart

d. Cusum chart

29. Measures of which of the following provide attributes data?

a. Temperature in degrees

b. Attendance at meetings

c. Weight in pounds

d. Length in metric units

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IIBM Institute of Business Management 5

30. The fraction of nonconforming products is plotted on which of the following types of control chart?

a. P chart

b. U chart

c. Np chart

d. C chart

31. A cause and effect diagram is a useful tool for doing which of the following?

a. Determining the flow of a process

b. Detecting shifts in a process

c. Developing theories based on symptoms

d. Arranging theories by defect count

32. Which of the following statistics would best describe the central tendency of a sample of data?

a. Mode

b. Mean

c. Standard deviation

d. Range

33. Which of the following types of tools or techniques is considered qualitative?

a. Histogram

b. Frequency distributions

c. Pareto chart

d. Process observations

34. Which of the following techniques is most useful in narrowing issues and limiting discussion?

a. Brainstorming

b. Quality function deployment

c. Cause and effect analysis

d. Mutilating

35. In statistics, an estimation error that is persistent or systematic is called

a. Bias

b. Sensitivity

c. Random

d. Shift

36. A customer satisfaction survey used the following rating scale:

1= very satisfied

2= Satisfied

3= Neutral

4= dissatisfied

5= very dissatisfied

This is an example of which of the following measurement scales?

a. Nominal

b. Ordinal

c. Ratio

d. Interval

37. Which of the following techniques is used in identifying underlying problems?

a. Cause and effect analysis

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IIBM Institute of Business Management 6

b. Prioritization matrix

c. Force field analysis

d. Pareto analysis

38. For a normal distribution, two standard deviation on each side of the mean would include what

percentage of the total population

a. 47%

b. 68%

c. 95%

d. 99%

39. In measurement system analysis, which of the following pairs of data measures is used to determine

total variance?

a. Process variance and reproducibility

b. Noise system and repeatability

c. Measurement variance and process variance

d. System variance and bias

40. Process data being used in the initial set-up of a process are assumed have a normal distribution. If the

nominal (target) is at the center of the distribution, and the specification limits are set at = 3 from the

center the Cpk is equal to

a. -0.25

b. 1.00

c. 1.33

d. 1.67

41. A green belt is going to monitor the number of defects on different size samples. Which of the

following control chart would be most appropriate?

a. u

b. np

c. c

d. p

42. Correction, over-production, inventory, and motion are all examples of

a. waste

b. 5S target areas

c. Noise

d. Value-added activities

43. The primary factor in the successful implementation of six sigma is to have

a. The necessary resources

b. The support/leadership of top management

c. Explicit customer requirements

d. A comprehensive training program

44. Which of the following types of variation is LEAST likely to occur in sequential repetitions of a

process over a short period of time?

a. Cyclical

b. Positional

c. Temporal

d. Seasonal

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IIBM Institute of Business Management 7

45. The primary reason that most companies implement six sigma is to

a. Reduce defects

b. Improve Processes

c. Improve profit

d. Increase customer satisfaction

46. The term used to describe the risk of a type I error in a test of hypotheses is

a. Power

b. Confidence level

c. Level of significance

d. Beta risk

47. One characteristic of attributes data is that it is always

a. continuous

b. Discrete

c. Expensive to collect

d. Read from a scale of measurement

48. Which of the following tests may be used to determine whether a sample comes from a population

with an exponential distribution?

a. T

b. F

c. Chi-square

d. ANOVA

49. Which of the following tools are appropriate for a quality engineer to use in qualifying a process that

has variable data?

I. An and R control chat

II. A his to gram

III. A cc hart

IV. A p chart

a. I and II only

b. II and III only

c. III and IV only

d. I, II, and IV only

50. The correlation coefficient for the length and weight of units made by a process is determined to be

0.27. if the process were adjusted to reduce the weight of each unit by 0.5 ounce, the correlation

coefficient of the length and weight of the units made by the new process would be equal to

a. 0.50

b. 0.27

c. 0.23

d. -0.23

51. A form, in either diagram or table format, that is prepared in advance for recording data is known as a

a. Cause-and-effect diagram

b. Pareto chart

c. Flowchart

d. Check sheet

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IIBM Institute of Business Management 8

52. A major drawback of using histogram in process control is that they

a. do not readily account for the factor of time

b. Are relatively difficult to construct and interpret

c. Require too many data points

d. Require too many intervals

53. Which of the following tools would be of the greatest use for finding the most efficient path and

realistic schedule for the completion of a project?

a. Interrelationship diagram

b. Activity network diagram

c. Tree diagram

d. Affinity diagram

54. A control plan is designed to do which of the following?

a. Supplement information contained in operator instructions

b. Support the production scheduling system

c. Provide a documented system for controlling processes

d. Provide a method for tracking the design review process

55. To determine the average number of nonconforming parts over time, which of the following attribute

control chart would be most appropriate?

a. A chat

b. Np chart

c. P chart

d. U chat

56. Which of the following techniques is most appropriate for generating continuous improvement ideas?

a. Tree diagram

b. Brainstorming

c. Prioritization matrix

d. Interrelationship diagraph

57. Which of the following tools is used extensively quality function deployment (QFD)?

a. Affinity diagram

b. Matrix diagram

c. Cause and effect diagram

d. Activity network diagram

58. Which of the following tools is most likely to be organizing a list of ideas generated during a

brainstorming session?

a. Activity network diagram

b. Affinity diagram

c. Histogram

d. Process control chart

59. Which of the following tools would be most appropriate for collecting data to study the symptoms of

a problem?

a. A check sheet

b. A flow diagram

c. A force field analysis

d. An activity network diagram

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IIBM Institute of Business Management 9

60. Kaizen is defined as

a. Re-engineering

b. Lean manufacturing

c. Continuous improvement

d. Error –proofing

61. The LEAST informative of the four measurement scales is the

a. Ratio

b. Nominal

c. Ordinal

d. Interval

62. Which of the following can used to determine the goodness of fit of a distribution to a data set?

a. T test

b. ANOVA

c. F rest

d. Chi square test

63. A fair coin is tossed 10 times. What are the expected mean and variance of the number of heads?

Mean variance

a. 0.5 0.025

b. 5.0 2.500

c. 5.0 5.000

d. 10.0 5.000

64. A process capability analysis is NOT used to

a. Determine the ability of a process to meet specifications

b. Maintain a process in a state of statistical control

c. Establish new specifications

d. Prioritize competing processes

65. A type of line graph used to assess the stability of a process is called a

a. Control chart

b. Pareto chart

c. Check sheet

d. cause and effect diagram

66. A process produces nonconformities according to a distribution. If the mean of the nonconformities is

25, what is the standard deviation?

a. 2.5

b. 5.0

c. 12.5

d. 25.0

67. Five six-sided dice are rolled together 100 times. Two histograms are constructed: one for the 500

individual results and one for the 100 averages of five results. In this situation, the individual results

follow a uniform distribution, while the averages follow which of the following distributions?

a. Normal

b. Student’s t

c. Binomial

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IIBM Institute of Business Management 10

d. Uniform

68. A calibrated micrometer was used to take 10 replicated measures of a reference standard. If X

m=0.073, and the true value of the reference standard is 0.075, what is the bias of the micrometer?

a. 0.001

b. 0.002

c. 0.073

d. 0.075

69. The power of a test for the difference between means is measured by

a. A

b. 1-a

c. B

d. 1-b

70. A process is stable and its output is normally distributed. The process has a specification of

16.73=0.01. What is the maximum process standard deviation if the Cp must be=1.5?

a. 0.0011

b.0.0022

c. 0.0041

d. 0.0133

71. Which of the following is the most effective technique for prioritizing critical factors foe problemsolving?

a. Venn diagram

b. Scatter diagram

c. Pareto diagram

d. Cause and effect diagram

72. The main advantage of a matrix diagram is that it

a. Displays all the possible causes related to a problem

b. Displays the strength of relationship between each paired combination of variables

c. Identifies, analyzes, and classifies the cause and effect relationship that among all critical issues

d. Identifies a sequence of actions and materials entering a process

73. Poka-yake is best defined as

a. Improving machine efficiency

b. Reducing field failures to virtually zero

c. Capturing the voice of the customer

d. Preventing controllable defects

74. Which of the following describes the 95% confidence interval of a 20% absentee rate in a department

with 30 people?

a. 6% to 34%

b. 8% to 32%

c. 13% to 27%

d. 17% to 23%

75. Which of the following are needed to calculate the process capability index,Cp?

a. The specification limits and the mean

b. The specification limits and s^ (Sigma Cap)

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c. The process mean and s^(Sigma Cap)

d. The upper and lower specification limits

76. Repeatability and reproducibility are terms that operationally define

a. Bias

b. Accuracy

c. Discrimination

d. Precision’

77. A method that classifies data without significantly reducing accuracy or precision is known as

a. Bias adjustment

b. Statistical efficiency

c. Blocking

d. Coding

78. If a process has a variance of 4 units and a specification of 96+4, what is the process performance

index (Pp)?

a. 0.33

b. 0.66

c. 1.00

d. 1.50

79. If a histogram has a distribution that is bimodal this indicates that the

a. Process is in control

b. Distribution is abnormal

c. Data collected is accurate

d. data has two points

80. Which of the following best describes how an affinity diagram is used?

a. Grasping organizational performance relative to contrasting data

b. Prioritizing data from most signification to least significant

c. Grouping ideas that are created during brainstorming

d. Identifying when a process is in control

81. Warranty claims are classified in which of the following cost of quality groups?

a. Internal failure

b. External failure

c. Appraisal

d. Prevention

82. At what stage of the problem-solving process would a team most likely use a cause-effect diagram?

a. Description of the process associated with the problem

b. Definition of the problem and its scope

c. Organization of possible problem causes

d. Collection of data to identify actual causes

83. Steel bars are cut to cylindrical shafts by means of a lathe. The diameter and allowable tolerance of

the shaft is 2.00=.001 inch. A control chart is used to monitor the quality level of the process. Which of

the following plots on the control chart might indicate a problem of wear on the lathe?

a. The diameter of a single shaft above 2.001 inch

b. the diameter of a single shaft below 1.999 inch

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c. An Apparent increasing trend in the shaft diameters

d. Erratic in-tolerance or out-of-tolerance diameter measurements

84. A sample consists of one or more units of product drawn from a lot or batch on the basis of

a. Defect of the product

b. Random selection

c. Size of the product

d. When the inspection process was completed

85. What is the percent yield for a normally distributed process in which the item length specification is

5.750=0.004, X is 5.752, and the standard deviation is 0.002?

a. 15.73%

b. 19.15%

c. 47.72%

d. 83.99%

86. In preparation for construction of a cause and effect diagram, it is important to

a. Plot separate chart for each source

b. Focus only on what makes thing go wrong

c. Record everything people suggest

d. Validate possible root cause

87. Which of the following tools should be used a team is generating and prioritizing a list of options that

include highly controversial issues?

a. Brainstorming

b. Affinity diagram

c. Nominal group technique

d. 5 whys

88. If a distribution is normal, u=50 s=15, what percentage of data will be less than 30?

a. 59.18%

b. 40.82%

c. 9.18%

d. 1.33%

89. A company is receiving an unusually high number of returns from various customers. The first step in

investigating the problem would be to

a. Check the inspection records

b. Establish the correlation of the returns to shipments

c. Brainstorm the potential causes

d. Classify the returns by type and degree of serious

90. Which of the following is the best definition of a flow chart?

a. A diagram used to structure ideas into useful categories

b. An illustration used to analyze variation in a process

c. A picture used to separate steps of a process in sequential order

d. An analytical tool used to clarify opposing aspects of a desired change

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91. Which of the following activities would NOT contribute to the effective functioning of a team?

a. Eliminating unnecessary activities

b. Development team performance measures

c. Defining process in detail

d. Monitoring each member’s performance

92. What is the standard deviation of the population below?

10, 4, 16, 12, 8

a. 4.00

b. 4.47

c. 16.00

d. 20.00

93. Which of the following tools would be most appropriate for collecting data to study the symptoms of

a problem?

a. Check sheet

b. Flow diagram

c. Force-field analysis

d. Activity network diagram

94. Which of the following measures is a sufficient statistic for the parameter u?

a. Median

b. Mid-range

c. Mean

d. Mode

95. Positional, cyclical, and temporal variations are most commonly analyzed in

a. SPC charts

b. Multi-vari charts

c. Cause and effect diagram

d. Run charts

96. Which of the following describes the deming method for continuous improvement?

a. Cost of quality analysis

b. Process map

c. Tree Diagram

d. Plan-do-check-act cycle

97. in analysis of variance, Which of the following distributions is the basis for determining whether the

variance estimates are all from the same population?

a. Chi square

b. Student’s

c. Normal

d. F

98. Which of the following statement best describes the set all value of a random variable?

a. It is finite.

b. It is an interval

c. It can be discrete or continuous.

d. It can be tracked by using control charts or scatter plots.

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IIBM Institute of Business Management 14

99. Which of the following is the best description of randomization?

a. A technique used to increase the precision of an experiment

b. A means of assuring representative sampling

c. The repetition of an observation or measurement

d. The relationship between two or more variables

100. When the order of items is not important, which of the following is the method to use to determine

the number of sets and subsets of items?

a. Combination

b. Permutation

c. Factorization

d. Simulation