1. Suppose that the standard deviation of a machine manufacturing process is 0.24 inch, and while the upper and lower specification limits are 4.2 and 2.6 inches. What is the process capability index? 2. Compute control limits for x – and R -charts for the data in the worksheet. Construct and interpret the charts. 3. Compute control limits for x – and R -charts for the data in the worksheet. Construct and interpret the charts.