Continuing the previous problem, operators have made an adjustment that they hope will improve the functioning of this process. The file P20_04.xlsx contains 25 subsamples of 6 observations each on the fill weights of cans of paint, taken after the process was modified.

a. Generate and interpret X and R charts for the given data. Which control limits do you believe are most appropriate? Explain. Does this filling process appear to be in control now?

b. Are there any other indications that the given process may be out of control now? If so, explain.

c. What advice would you give to the operators of this filling process based on your analysis of the latest sample information?