The UCl and LCL for an x chart 25 and 20 respectively . The central line is 20 and the process variability is considered to be in statistical control . The results of the next 6 sample means are 18, 23, 17, 21, 24, and 16. What should you do? Draw a chart carefully labeling all parts: UCL and LCL, the mean and sample points to support your answer.
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