The $\bar { x }$ chart is employed to determine whether the process distribution means have changed.To determine whether the process distribution standard deviation has changed,we use the S (which stands for standard deviation)chart.

Question

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The S chart is used to monitor the process standard deviation and detect any changes, while the $\bar { x }$ chart is used to monitor the process mean.

The xˉ\bar { x }xˉ Chart Is Employed to Determine Whether the Process Distribution Means

The $\bar { x }$ Chart Is Employed to Determine Whether the Process Distribution Means