Approximately 99.7% of sample means will fall within $\pm$two standard deviations of the process mean if the process is under control.

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Question

Approximately 99.7% of sample means will fall within  $\pm$two standard deviations of the process mean if the process is under control.

Quizplus · Accepted Answer

Approximately 99.7% of sample means fall within $\pm$three standard deviations of the process mean, not two, according to the empirical rule for a normal distribution.

Approximately 99 ±\pm± Two Standard Deviations of the Process Mean If the Process

Approximately 99 $\pm$ Two Standard Deviations of the Process Mean If the Process