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Six Sigma 2017 > QOM 2017 - Six Sigma - Test 2012A > Flashcards

QOM 2017 - Six Sigma - Test 2012A Flashcards

1
Q

The funnel experiment, firstly proposed by
Deming, shows that:
A. If the natural variation of the process is too
big, try to make adjustments
B. Common causes of variation are not
eliminable
C. If the natural variation of the process is too
big, there is nothing to do
D. You cannot reduce the variation of a
process by continuously tampering it

A

D. You cannot reduce the variation of a

process by continuously tampering it

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2
Q

What does not apply for the purpose of the
Define phase?
A. To clearly establish the purpose of the
project
B. To establish the boundaries of the project
C. To establish specific metrics for the project
D. None of the above

A

D. None of the above

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3
Q

What is the rolled throughput yield for this
process? The process has 5 steps and yield of
each step is as follows: 90%, 90%, 80%, 80%
and 100%.
A. 80%
B. 40%
C. 52%
D. 100%

A

C. 52%

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4
Q 
The quality of a decision depends on the
performance of the measurement system
relative the process monitored, samples
investigated and data collected. The
measurement system (MS) performance is
characterized by accuracy and precision. What
is wrong about measurement system analysis
(MSA)?
A. MSA determines the number of
discrimination levels the actual MS has
relative the variation studied
B. MSA assumes that the MS is stable and predictable
C. Reproducibility determines weaknesses in
measurement instructions
D. Precision in measurements need to be
evaluated for each measurement situation
where the MS is used
A

B. MSA assumes that the MS is stable and predictable

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5
Q

VOP ≤ VOC can be interpret as (choose most
relevant):
A. Control limits are wider than specification
limits
B. There is a potential issue with waste and
rework from the process
C. There is a little margin for long term drift
in the process
D. Income does not cover process cost

A

C. There is a little margin for long term drift

in the process

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6
Q 
Which of the following is not a method of
hypothesis testing?
A. DOE
B. General linear model
C. FMEA
D. SPC
A

C. FMEA

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7
Q

Which of the following tests is used when the
response and the factor are both attribute data?
A. Paired t-test
B. ANOVA
C. Regression analysis
D. Chi Square

A

D. Chi Square

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8
Q

What is not true for lean?
A. Lean metrics connects to flow effectiveness
B. Lean metrics are influenced by variation
C. Lean principles apply to materials,
information and services
D. Demand rate identifies the minimal
percentage of value added versus nonvalue
added lead-time required

A

D. Demand rate identifies the minimal
percentage of value added versus nonvalue
added lead-time required

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9
Q

In the “Control” phase, besides verifying
improvements, which of the following is
generally not a primary issue?
A. Control charts on important performances
B. EDA on historical data
C. Potential-FMEA
D. Plan how to act on deviations

A

B. EDA on historical data

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10
Q

What is not true for control charts usage:
A. Used to monitor the process over time
B. Used when the process is stable over time
C. Used when the specification limits are too
restrictive
D. Used when we do not have specification
limits

A

B. Used when the process is stable over time

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11
Q

In a Gage R&R study we would like to discover:
A. low repeatability and low reproducibility
B. if repeatability is different from
reproducibility
C. possible causes of poor reproducibility and
repeatability
D. that there is a drift in the measurement
process

A

C. possible causes of poor reproducibility and

repeatability

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12
Q 
What is most relevant for using DOE?
A. When 1 factor at one-factor-at-a-time
hasn’t been validated yet
B. On every project in Improve phase
C. When multiple factors have significant
interactions
D. When the transfer function is known
A

C. When multiple factors have significant

interactions

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13
Q

Fractional design of experiment is used for
A. Screening
B. Improving resolution of the experiments
C. Sorting out interactions with more factors
D. One factor at a time (OFAT)

A

A. Screening

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14
Q 
Which of these designs is saturated?
A. 2^(6-3)
B. 2^(5-1)
C. 2^(3-1)
D. None of the above
A

C. 2^(3-1)

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15
Q

When factor levels, in DOE, are kept close.
A. Influence of noise on the result is limited
B. The relative importance of different factors
is easily ranked
C. The relation between demand rate and
value-added ratio is easily determined
D. Risk of erroneous conclusion increases

A

D. Risk of erroneous conclusion increases

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16
Q

Successful selection of projects rely on
A. Possibility to carry through all DMAIC
phases
B. Close connection to variation in
organizational metrics
C. Suppliers to the process are beyond control
of the process owner
D. Value stream mapping are well established
for the process in mind

A

B. Close connection to variation in

organizational metrics

17
Q

All of the following experimental designs could
be used to investigate interactions EXCEPT
A. half-fraction
B. half-fraction with replication
C. full-factorial with replication
D. saturated design with replication

A

D. saturated design with replication

18
Q

For a stable and normally distributed process
with two sided specification limits with Cp=1,
Cpk less than 1, which of the following
statement about the estimate of percent nonconforming
products is correct?
A. Equal to 0.27%
B. Greater than 0.27%
C. Less than 0.27%
D. None of the above

A

B. Greater than 0.27%

19
Q

When the subgroup size in constructing threesigma
Xbar-and-R chart is increased
A. The control limits become wider and the
false alarm rate decreases
B. The control limits become narrower and
the false alarm rate increases
C. The control limits become wider and the
false alarm rate remains the same
D. The control limits become narrower and
the false alarm rate remains the same

A

D. The control limits become narrower and

the false alarm rate remains the same

20
Q

All factors (X’s) in a factorial design 2^(k-p) are
A. controllable
B. orthogonal
C. estimated using average of differences
D. all of the above

A

D. all of the above

21
Q

In the context of testing sample mean, for the
same sample data set, which of the following statement about p-value is correct:
A. The p-value depends on the selected alpha,
that is, the higher the alpha value the lower the p-value becomes
B. Various p-value may be obtained depending on the null hypothesis formulation
C. There is only one p-value regardless of the
null hypothesis formulation
D. None of the above

A

B. Various p-value may be obtained depending on the null hypothesis formulation

22
Q

In general, when constructing Xbar-and-R
chart, three-sigma limits are used. What is the
effect of using limits higher than three-sigma,
e.g. four-sigma limits?
A. False alarm rate will increase, but the
sensitivity of the chart to detect change
will decrease
B. Both false alarm rate and sensitivity of the
chart to detect change will increase
C. False alarm rate will decrease, but the
sensitivity of the chart to detect change
will increase
D. Both false alarm rate and sensitivity of the
chart to detect change will decrease

A

D. Both false alarm rate and sensitivity of the

chart to detect change will decrease

23
Q

In the context of a 2K factorial design, if there is
an active interaction between factor A and
factor B, it means that
A. Factor A is dependent on factor B
B. Factor B is dependent on factor A
C. Factor A is dependent on factor B and vice
versa
D. None of the above

A

D. None of the above

24
Q

If there are 17 runs available, what is the
maximum number of two-level factor that can
be studied without confounding effects?
A. 4
B. 5
C. 16
D. None of the above

A

A. 4

25
Q

For the same sample data set, which of the
following statement about the confidence level
is correct:
A. The higher the confidence level, the
narrower the confidence interval becomes
(e.g. 99% confidence level will have a
narrower interval than that of 95%
confidence level)
B. The selection of confidence level does not
affect the width of the confidence interval
C. The higher the confidence level, the wider
the confidence interval becomes (e.g. 99%
confidence level will have a wider interval
than that of 95% confidence level)
D. None of the above

A

C. The higher the confidence level, the wider
the confidence interval becomes (e.g. 99%
confidence level will have a wider interval
than that of 95% confidence level)

Six Sigma 2017 (10 decks)

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