Factor for Determining from R the Three-Sigma Control Limits for X - and R-Charts R=UCLR=D4RR=LCLR=D3R Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. Use Exhibit 13.7. To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows: Use three-sigma control limits. a. Calculate the mean and range for the above samples. (Round "Mean" to 2 decimal places and "Range" to the nearest whole number.) b. Determine X and R. (Round your answers to 3 decimal places.) c. Determine the UCL and LCL for a X chart. (Round your answers to 3 decimal places.) d. Determine the UCL and LCL for R-chart. (Leave no cells blank - be certain to enter "O" wherever required. Round your answers to 3 decimal places.) e. What comments can you make about the process? The process is in statistical control. The process is out of statistical control