dolution
dolution.
Continuing the previous problem, managers have made an adjustment that they hope will improve the functioning of this process. The file P20_07.xlsx contains 25 subsamples of 4 observations each on selected bolt lengths, taken after the production process was modified.
a. Generate and interpret 
 and R charts for the given data. Which control limits do you believe are most appropriate? Explain. Does this production process appear to be in control now?
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c. What advice would you give to the operators of this production process based on your analysis of the latest sample information?
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