Deming's Funnel Experiment illustrates that people can and do create unwanted process variation by indiscriminately trying to remove common-cause variation.

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Deming's Funnel Experiment demonstrates that when individuals attempt to remove common-cause variation by making adjustments to a stable process, they can actually create unwanted process variation, leading to decreased quality and increased costs.

Deming's Funnel Experiment Illustrates That People Can and Do Create