Answer :
The statement-
In a control chart, the UCL and LCL represent plus or minus three standard deviations is true
What is control chart?
Control chart is a graph used to measure the how a change occurs in a process over time. There are three lines in a control chart. A central line which denotes the average, a lower line which denotes the lower control limit and an upper line which denotes the upper control limit.
In a control chart, the UCL is the Upper Control Limit and LCL is the Lower Control Limit.
LCL and UCL are three standard deviation from the mean of the data set
If s is the standard deviation of the sample, -3s is the LCL and +3s is the UCL
So the statement,
In a control chart, the UCL and LCL represent plus or minus three standard deviations is true
To learn more about Control chart, refer to the link-
https://brainly.com/question/26478724
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