The file P20_11.xlsx contains data on the amount of liquid detergent (in ounces) placed in plastic containers by a particular filling process. Ideally, the filling process should place 100 ounces of detergent in each container. Every hour, 6 detergent containers were randomly selected from the production process and measured for amount of fill. This was repeated for 25 consecutive hours.

a. Generate and interpret X and R charts for the given data. Does this filling process appear to be in control?

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

c. Given your analysis of the sample information, what steps, if any, should be taken to adjust this filling process?