Author Question: For an x-bar chart where the standard deviation is known, the Upper Control Limit (Read 82 times)

piesebel · **on:** Dec 3, 2019

Question 1

The Central Limit Theorem
◦ controls the steepness of an operating characteristic curve.
◦ is the theoretical foundation of the c-chart.
◦ allows managers to use the normal distribution as the basis for building some control charts.
◦ states that the average range can be used as a proxy for the standard deviation.
◦ states that the average of assignable variations is zero.

Question 2

For an x-bar chart where the standard deviation is known, the Upper Control Limit
◦ is 3 . σ below the mean of sample means for a 3σ control chart.
◦ is 3 . σ above the mean of sample means for a 3σ control chart.
◦ is 3 . σ/

above the mean of sample means for a 3σ control chart.
◦ is 3 . σ/

below the mean of sample means for a 3σ control chart.
◦ Cannot be calculated unless the average range is known.

adf223 · **Reply #1 on:** Dec 3, 2019

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