For a 3-Sigma X-Bar Chart Where the Process Standard Deviation

question 30

Multiple Choice

For a 3-sigma x-bar chart where the process standard deviation is known,the upper control limit:

• A)is 3σ below the mean of sample means for a 3σ control chart.
• B)is 3σ above the mean of sample means for a 3σ control chart.
• C)is 3σ/ below the mean of sample means for a 3σ control chart.
• D)is 3σ/ 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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