Question: The data in the Engine Piston Rings Excel file presents the inside diameter measurements of forged automobile engine piston rings in mm . Each sample

The data in the Engine Piston Rings Excel file presents the inside diameter measurements of forged automobile engine piston rings in mm. Each sample or subgroup consists of five piston rings taken every 15 minutes from a process. Assume that the upper and lower specification limits on the inside diameter of the engine ring pistons are 74.000\pm 0.05 millimeter.
Use this data to construct and plot X-bar and R control charts. Is the process under control? why? Calculate process capability index.
Use this data to construct and plot X-bar and S control charts. Calculate process capability index.
Are the two estimated indices in parts a and b are different? Why?
Explain under what condition you are allowed to calculate process capability index.

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