QOM 2017 - Six Sigma - Test 2014B1 Flashcards
By what means does Six Sigma contribute to economic, social or environmental sustainability?
a) Conducting a brainstorm
b) Designing an experiment
c) Reducing variation
d) Drawing a process map
c) Reducing variation
Even though the DMAIC phases are not serial, which one of the following is NOT an activity normally considered to be in the Analyze phase?
a) Study the causes of defects
b) Understand the sources of variation
c) Prioritize opportunities for future improvements
d) Developa data collection plan
d) Develop a data collection plan
When you are running a BB project, what should you consider doing first of the following:
a) Evaluate the measuring system by performing an MSA
b) Define who needs the measurement result
c) Decide how the measurement result should be presented
d) Choose measuring device based on its accuracy
b) Define who needs the measurement result
In the project you are running, two operators handle the critical operation. They are supervising the operation and inspect the ready parts before shipment. Which of the following statements is FALSE?
a) The operation could be unstable
b) The operators’ judgment could be considered as a measurement system
c) There could be a problem with the repeatability and reproducibility of the
inspection
d) It is required to have a standard describing how the inspection should be performed
d) It is required to have a standard describing how the inspection should be performed
Why is it important to have orthogonal columns in a DoE design table?
a) To make sure that the contrasts can be calculated independently.
b) To be able to calculate the maximum number of contrasts from a set number of degrees of freedoms.
c) It is the rows of the design matrix that should be orthogonal.
d) To allow for calculations of process variance.
a) To make sure that the contrasts can be calculated independently.
It was found out that the correlation between a response variable (Y) and a predictor (X) is low, that is, less than 0.1. It implies that
a) When the value of X is high, the value of Y is almost always high.
b) When the value of X is high, the value of Y is almost always low.
c) When the value of X is low, the value of Y is sometimes high, but sometimes low.
d) When the value of X is low, the value of Y is almost always low.
c) When the value of X is low, the value of Y is sometimes high, but sometimes low.
Tom is a Six Sigma black belt. He is very happy because his process, which is normally distributed, has a Cp of 2. Which of the following can be said about his process?
a) It is certain that the process is a six sigma process, having a defective rate of 3.4
ppm
b) It is possible that the process has more than 50% non-conforming items
c) It is possible that the control limits of the Xbar chart coincide with the specification limits, that is, UCL=USL and LCL=LSL
d) None of the above
b) It is possible that the process has more than 50% non-conforming items
Consider two explanatory variables (X1 and X2) which have substantial effects on a response variable (Y), in terms of statistical significance and effect size, when tested separately, that is, Y=f(X1) and Y=f(X2)). However, when they are tested together, Y=f(X1, X2), one of the explanatory variables becomes insignificant. Which of the following is very likely to be the cause?
a) The low correlation between X1 and X2
b) The high correlation between X1 and X2
c) The fact that X1 and X2 are orthogonal to each other
d) None of the above
b) The high correlation between X1 and X2
When using a control chart, one may have a false alarm. Which of the following statements about false alarm is WRONG?
a) A false alarm reflects randomness in a process
b) A false alarm can be set theoretically by changing the multiplier of the control
limits (e.g. from three-sigma limits to four-sigma limits)
c) A false alarm is a signal when the process is under statistical control
d) None of the above
d) None of the above
When doing screening experiments the price for lower number of experiments is aliasing, which increases the risk of identifying the wrong significant factors and interactions. To support the evaluation of screening experiments, three guiding principles have been pointed out: Hierarchical Ordering Principle, Effect Sparsity Principle and Effect Heredity Principle. Which explanation below belongs to the Effect Sparsity Principle?
a) Lower order effects are more likely to be important than higher order effects.
b) The numbers of relatively important effects in a factorial experiment are small.
c) In order for an interaction to be significant, at least one of its parent factors should be significant.
d) Effects of the same order are equally likely to be important.
b) The numbers of relatively important effects in a factorial experiment are small.
What is the primary purpose with the control plan?
a) To guide what actions to take when process deviates in future
b) To follow-up on critical key performance indicators
c) To set future targets
d) To communicate project learning
a) To guide what actions to take when process deviates in future
In the supporting infrastructure for Six Sigma Black Belts developed by many organizations, some standard roles are identified. Which role is normally responsible for coordinating Six Sigma project selection?
a) Master Black Belt
b) Process owner
c) Deployment champion
d) Black Belt line manager
c) Deployment champion
Noise factors are the main target for both Six Sigma and DFSS. They are classified normally in five groups: aging, environmental conditions, usage, manufacturing variation and…?
a) Failure modes
b) Control factors
c) System interactions
d) Measurement noise
c) System interactions
The main purpose with this set-up of the Chalmers Six Sigma program is to:
a) train statistical engineering tools
b) solve a complex problem
c) understand that how what why
d) understand the application of the DMAIC phases
understand the application of the DMAIC phases
