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

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.