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

question 28

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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