For an X-Bar Chart Where the Standard Deviation Is Known,the

question 139

Multiple Choice

For an x-bar chart where the standard deviation is known,the Upper Control Limit

• A)is 3 .σ below the mean of sample means for a 3σ control chart.
• B)is 3 .σ above the mean of sample means for a 3σ control chart.
• C)is 3 .σ/ below the mean of sample means for a 3σ control chart.
• D)is 3 .σ/ above the mean of sample means for a 3σ control chart.
• E)Cannot be calculated unless the average range is known.

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