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Find the control limits for the Averages chart

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...
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Find the control limits for the Range Chart

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...
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Find the Control limits for the Averages charts

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...
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What is true about rational subgroups?

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...
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Which of these charts help answering the question?

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.
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Which of these charts help answering the question?

‘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.
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