QOM 2017 - Six Sigma - Test 2014A

Question 1

Which of the following statement is correct
concerning p-value?
a) It is the probability of the null hypothesis being
true given the observed data (evidence)
b) It is the probability of rejecting the null
hypothesis when it is false
c) It is the probability of not rejecting the null
hypothesis when it is false
d) None of the above

Answer 1

d) None of the above

Question 2

Using the same null hypothesis and alpha (type 1
error), what will happen if one doubles the sample
size when testing the mean value of a process?
a) Both p-value and the confidence interval will
change
b) P-value will change, but the confidence interval
will remain the same
c) P-value will remain the same, but the
confidence interval will change
d) Both p-value and confidence interval will remain
the same

Answer 2

a) Both p-value and the confidence interval will

change

Question 3

Which of the following strategy is advisable in order
to have a higher precision of sampling results?
a) Increase confidence level, e.g. from 95% to
99%
b) Increase sample size
c) Use lower type I error, e.g. using 1% instead of
5%
d) All of the above

Answer 3

b) Increase sample size

Question 4

Consider a sample data of size more than 200. The
statistical software shows that the mean is much
lower than the median and the mode. This means
that
a) The Gaussian distribution can fit the data well
b) The skewness of the sample data is positive
c) The standard deviation of the sample data is
less than zero
d) None of the above

Answer 4

d) None of the above

Question 5

Consider two sets of data of the same size with the
same mean and the same standard deviation. Which
of the following statement is correct?
a) They certainly have the same distribution
b) They certainly have the same confidence
interval
c) They certainly have the same kurtosis
d) None of the above

Answer 5

b) They certainly have the same confidence

interval

Question 6

Which one of this is NOT classified as a ’value
stream’ in the flow of information and material?
a) Product inspection by machine operators.
b) Purchaser entering supplier details into
database.
c) Engineers performing Design of Experiment.
d) Packer preparing boxes for packing of products.

Answer 6

c) Engineers performing

Question 7

The steps to conducting surveys are in this order:
a) Establish goals – choose sample – create
questionnaire – test – conduct survey
b) Choose sample – establish goals – test – create
questionnaire – conduct survey
c) Establish goals – create questionnaire – test –
choose samples – conduct survey
d) Create questionnaire – choose samples –
establish goals – test – conduct survey

Answer 7

a) Establish goals – choose sample – create

questionnaire – test – conduct survey

Question 8

Which one of these is defined as Critical-to-Process
characteristic?
a) Voice of customers
b) Product inspection
c) Design parameters
d) ISO standards

Answer 8

b) Product inspection

Question 9

The purpose in ‘Effective scoping” to first define
“what to improve (the small y)” is:
a) To limit the project to the relevant causes
b) To limit the project to the relevant process
c) To limit the project to the relevant team
d) To limit the project to the relevant customer
expectation

Answer 9

d) To limit the project to the relevant customer

expectation

Question 10

The lack of Repeatability is defined as
a) the variation obtained when an operator is
repeatedly measuring the same object with the
same measuring instrument
b) the variation obtained when different operators
are measuring the same object with the same
measuring instrument
c) the variation obtained when the same object are
measured by the same operator with different
measuring instruments
d) the variation obtained when different operators
are measuring the same object with the
different measuring instruments

Answer 10

a) the variation obtained when an operator is
repeatedly measuring the same object with the
same measuring instrument

Question 11

The scatter plot:

a) is a graphical tool to show bivariate data
b) is a probability plot
c) compares means of groups in data
d) does not help to see if data are correlated

Answer 11

a) is a graphical tool to show bivariate data

Question 12

Kappa is used to
a) estimate process capability relative to customer
requirements
b) evaluate measurement systems using ordinal
data
c) compare each rater to all other raters in a visual
inspection system
d) to quantify how bad a misclassification is

Answer 12

c) compare each rater to all other raters in a visual

inspection system

Question 13

The most important role of statistics in Six Sigma is
to:
a) facilitate team building
b) show tables, graphics and p-values
c) create linear models with error terms
d) make quantitative analyses and base decisions
on facts

Answer 13

d) make quantitative analyses and base decisions

on facts

Question 14

Upper and lower control limits are:
a) upper and lower specification limits
b) based on common causes of random variation in
the process
c) applied when sample data fall outside
specification limits
d) based on customer requirements

Answer 14

b) based on common causes of random variation in

the process

Question 15

A process map should be able to:
a) increase customers satisfaction
b) instill top management commitment
c) delimit the scope of a six sigma project
d) facilitate the brainstorming of potential root
causes

Answer 15

d) facilitate the brainstorming of potential root

causes