QOM 2017 - Six Sigma - Test 2015B1

Question 1

One of the following suggestions is false. Critical criteria for successful improvement projects are:

a. Learning and reflection
b. Management for improvement
c. Limited pressure for change
d. Problem analysis

Answer 1

c. Limited pressure for change

Question 2

One of the following suggestions is false. Inner motivation is a crucial component for sustainable development. According to Deci & Ryan, the concept entails:

a. A shared vision
b. Autonomy
c. Personal development
d. Meaning

Answer 2

a. A shared vision

Question 3

You are measuring a diameter on a machined axis using a digital caliper. You get the value 20.02 mm. You have performed a MSA and the result showed that the caliper is a good measurement system for this process. What is false?
a. The value 20.02 mm includes the true value and the measurement error
b. The axis has a true diameter of 20.02 mm
c. The Voice of the Customer states that the axis
needs to have a diameter between 19 and 21
mm. I can mark the axis with a “OK”-sign.
d. If I measure more axes I can use the
measurement result for process improvement analyses

Answer 3

b. The axis has a true diameter of 20.02 mm

Question 4

‘Monitor y - manage x’ is a general driving force in Lean Six Sigma. What is most incorrect interpretation of that:

a. The control plan describes actions recommended when y deviates
b. Focus on x increase customer satisfaction and lower cost
c. Control charts can be used to visualize variation inx
d. Measurement systems for both x and y need to be qualified

Answer 4

a. The control plan describes actions recommended when y deviates

Question 5

Empirical rule for scatter state that ±2s deviation from the mean embrace X percent of the natural variation from any distribution. X is:

a. 50-55%
b. 60-75%
c. 90-98%
d. 99-100%

Answer 5

c. 90-98%

Question 6

When paired t-test indicates a significant difference between two populations what characteristic is true?
a. The mean difference is large than zero
b. The mean difference significantly deviates from
a reference value
c. Zero is within the confidential band
d. Zero is outside the confidential band

Answer 6

d. Zero is outside the confidential band

Question 7

An important diagnostics when analyzing data is to study the residuals in order to find out if there is more information hidden in the data. What is NOT true about residuals:

a. Residuals are random and normal distributed with zero mean
b. Residuals show no trend versus time and order of measure
c. Residuals increase with the predicted model value
d. Residuals are used to calculate the standard error of the regression

Answer 7

c. Residuals increase with the predicted model value

Question 8

What is a correct description of ‘a replicate’?
a. Multiple observations of the same experimental
run (no adjustments of the settings, average of
responses)
b. Minimizes within subgroup error
c. Gives information to predict measurement noise
in the system
d. Duplication of a series of runs (takes error
setting up equipment into account)

Answer 8

d. Duplication of a series of runs (takes error

setting up equipment into account)

Question 9

Within a control plan both XmR charts and EWMA charts are commonly proposed as new simultaneously used monitoring methods. Why?

a. XmR follow within sub-group variation, EWMA follow between sub-group variation
b. XmR is used for continuous data and EWMA for attribute data
c. XmR charts detects unusual large deviation from the mean, EWMA detects small shift/changes in a process
d. XmR is used for normal distributed data and EWMA is used for skewed data (one sided)

Answer 9

c. XmR charts detects unusual large deviation from the mean, EWMA detects small shift/changes in a process

Question 10

Lean Six Sigma Black Belts that struggles with small experimental budgets and many potentially significant factors is guided by three principles for sequential DoE: hierarchical ordering principle, effect scarcity principle, and effect heredity principle. What does latter one refer to (the effect heredity principle):

a. Lower order effects are more likely to be important than higher order effects.
b. In order for an interaction to be significant, at least one of its parent factors should be significant.
c. Effects of the same order are equally likely to be important.
d. The numbers of relatively important effects in a factorial experiment are small.

Answer 10

b. In order for an interaction to be significant, at least one of its parent factors should be significant.