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The SPC Control Chart, also known as the Shewhart chart, is a tool used to determine whether a manufacturing process is in a state of statistical control or not. If the chart indicates that the process is currently under control then it can be used with confidence to predict the future performance. If the chart indicates that the process being monitored is not in control, the pattern it reveals can help determine the source of variation to be eliminated to bring the process back into control.
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