Month: December 2021

OPTIONS Xbar R Xbar S P chart EWMA Chart ANSWER EWMA Chart EXPLANATION Correct answer: (D) Control limits in an EWMA chart vary on the lines of an exponential distribution, so EWMA Chart is correct.

OPTIONS Sub group statistics are important to be representedSub group sigma is generally more accurateSub group sigma doesn’t introduce unnecessary special causeRange is considered better than Sigma ANSWER Sub group sigma doesn’t introduce unnecessary special cause EXPLANATION The primary for reason for doing what is...

For sum of sub group averages at 2487, number of subgroups is 25 and each subgroup having 5 samples, the control limits for the Averages chart are OPTIONS 91, 108 81, 121 0, 100 70, 131 ANSWER 91, 108 EXPLANATION Using Control Chart constants, the...

For sum of sub group ranges to be at 369 and the number of subgroups is 25 with each subgroup having 5 samples, the control limits for the Range Chart are OPTIONS 0, 25 0, 31 11, 25 11, 31 ANSWER 0, 31 EXPLANATION Using...

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.