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IASSC LSSGB EXAM Questions & answers
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IASSC LSSGB EXAMIf the chance that any one of five telephone lines is busy at any instant is 0.01, then
what is the probability that all the lines are busy?
A. (0.01)^4
B. (0.01)^5
C. (0.01)^6
D. (0.01)^10 - ANS-B. (0.01)^5
N = 5, p = 0.01, x = 5 Apply Standard formula for Binomial Distribution. Thus, option b is
the correct answer.
Who should complete the control phase after the successful completion and
implementation of the first four phases of DMAIC?
A. The green belt alone; the project has been successfully completed.
B. The process owner alone; it is his responsibility to take the project from here.
C. The process owner and the Green Belt together should complete the control phase.
D. The complete team is the most desirable option. - ANS-D. The complete team is the
most desirable option.
The control phase should be completed by the entire team. Control is not an
insignificant phase of the DMAIC process. The green belt or the process owner alone
may not have the ability and knowledge to structure the last control step. So option d is
correct.
To increase the power of the experiments, what is the best choice in the hands of a Six
Sigma team?
A. Increase Sample Size
B. Reduce Sample Size
,C. Reduce Significance level
D. All of the above - ANS-A. Increase Sample Size
Options b and c are not serious considerations, and thus option d can be ruled out.
Conceptually, increase in sample size increases the possible accuracy of the
experiment, and thus an increase in power. So, option a is the correct answer.
Hypothesis testing is usually done to:
A. Statistically validate if a sample mean belongs to the population
B. Statistically validate if means of two groups are the same or if they are significantly
different
C. Statistically validate if variances of two groups are the same or if they are different.
D. All of the above - ANS-D. All of the above
Statistically validate if a sample mean does belong to the population, find if means of
two groups are the same or if they are significantly different, and validate if variances of
two groups are the same or if they are different. Option d is the correct answer.
What is the concept behind PDCA?
A. The Deming/Shewhart cycle
B. Process flow
C. Continuous improvement
D. Satisfying suppliers - ANS-C. Continuous Improvement
The key question phrase is "concept behind." Option b is inappropriate and does not fit
the question. Option a would be correct if the question requested another name for
PDCA. Answer option d could be one of the number of potential positive outcomes of
this activity. However, the concept behind and objective of PDCA is that of continuous
improvement.
What are the six experiments called while performing one experiment with five
repetitions?
,A. Randomization
B. Replications
C. Planned grouping
D. Sequential - ANS-B. Replications
Repeated trials or replications are often conducted to estimate the pure trial-to-trial
experimental error so that lack of fit may be evaluated. Randomization frees an
experiment from the environment and other biases. Sequential experiments are
conducted one after another, not all at the same time. Adjustments may be made in the
experimentation based upon the knowledge obtained. Almost any DOE contains
planned grouping. So answer option b is correct.
Which type of chart is used for small shifts in variation?
A. Xbar
B. p
C. c
D. CUSUM - ANS-D. CUSUM
The other charts are traditional control charts that are designed to identify significant
shifts in process variation, while the CUSUM chart is designed to show small variation
shifts
What are the distinct types of variation that are noted down in control charts?
A.Special and assignable
B. Random and chance
C. Chance and assignable
D. Normal and random - ANS-C. Chance and assignable
Chance and assignable are the two varieties of variation. Chance variation is also
referred to as normal or random (among others). Assignable variation is also called
special or non-normal. So option c is correct.
Which of the following is an advantage of the production of a product in large lots?
A. Machine efficiencies
B. Customer delivery lead times
C. Product transportation
D. Product quality - ANS-A. Machine efficiencies
, According to the proponents of lean manufacturing and continuous flow, options b, c,
and d are all disadvantages. For large lot processing delivery lead times increases,
transportation of products increases, and products have more potentiall for damage.
Option a is generally recognized as the main advantage of large batch runs that may be
more than offset by the disadvantages. So option a is the correct choice.
A sample is to a statistic as a population value is to a:
A. Sample
B. Unit
C. Parameter
D. Measurement - ANS-C. Parameter
A statistic is derived from a sample. A parameter is derived from a population. So option
c is correct.
A calculation for reproducibility results in a value of 0 (zero), while repeatability yields a
positive number. Without any other considerations, what conclusion can be made
regarding the reproducibility result?
A. The number of distinct categories is small compared to the appraiser variation.
B. Operator influence in the measurement is the main cause of variation.
C. Repeat the calculations; no conclusion can be determined without a reproducibility
value.
D. A reproducibility of zero means there is no operator effect on this measurement. -
ANS-D. A reproducibility of zero means there is no operator effect on this measurement.
It is possible to have a reproducibility result of zero when studying automated
equipment. Sometimes the appraiser only places a part in an instrument and an
automatic reading is recorded in a database. There is no appraiser or operator effect in
this kind of measurement, therefore, reproducibility is zero. So option d is correct.
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