Tag: Lean Six Sigma Black Belt Exam

The mean of Ranges of a process sample collected across 20 samples is 6, and the mean of averages is 10 with the sample size of 8 per sample. The Control limits for the Averages charts are OPTIONS 6,14 7, 13 7.76, 12.24 8.1, 11.9...

OPTIONS Xbar – R Xbar – S EWMA I-MR ANSWER I-MR EXPLANATION Of all these charts, I-MR is considered most sensitive to non-normality of data.

OPTIONS They are taken from a homogeneous sample They always represent the same readings They are produced essentially under the same conditions They give a good outline of how variations are, in the process ANSWER They are produced essentially under the same conditions EXPLANATION Rational...

Have any small process shifts resulted in the process to exhibit unusual patterns in dispersion? OPTIONS Range Chart Average Chart Sigma Chart EWMA Chart ANSWER EWMA Chart EXPLANATION EWMA charts are popularly used for detecting small process shifts.

‘Has special cause of variation resulted in central tendency to move or shift over a period of time?’ OPTIONS Range Chart Averages Chart Sigma Chart EWMA Chart ANSWER Averages Chart EXPLANATION \Averages chart show movement of central tendency.

OPTIONS BlockingRandomizationReplicationCoding ANSWER Blocking EXPLANATION Blocking helps you to eliminate variation due to extraneous factors thus BLOCKING is correct.

OPTIONS Introduced a Dummy Variable Introduced a Center Point Coded the Factors Set levels for the factors ANSWER Coded the Factors EXPLANATION When scales are changed to -1 and +1, coding happens.

OPTIONS Full factorial design Nested Design Crossed Design Balanced Design ANSWER Balanced Design EXPLANATION A Balanced Design always has the same number of observations.

OPTIONS DOE ANOVA Homogeneity of Variances Setting up Control Limits ANSWER ANOVA EXPLANATION ANOVA always separates variability of a group of observations into assignable causes thus anova is correct.

OPTIONS Interactions are tested, but the results are available for main effects only Interactions get aliased with main effects All main effects are considered significant All interactions are considered insignificant ANSWER Interactions are tested, but the results are available for main effects only EXPLANATION In...