An X bar chart includes the following data: The mean of data ranges from 4 to 16 on the Y axis. The group ranges from 2 to 20 on the x axis. The upper control limit is 14.50. The average is 9.92. The lower control limit is 5.34. The mean approaches the upper control limit at approximately 3 on the X axis. After that it has a negative direction with several vertical spikes. It never crosses over either control limit.
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