The sample means were calculated for 30 samples of size n = 10 for a process that was judged to be in control. The means of the 30 ̅x-values and the standard deviation of the combined 300 measurements were = 20.74 and s = .87, respectively.
a. Use the data to determine the upper and lower control limits for an ̅x chart.
b. What is the purpose of an ̅x chart?
c. Construct an ̅x chart for the process and explain how it can be used.
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