Exhibit 17-13 A company's production process has a process range of 20 inches when operating properly. However, the company is concerned about whether the process is still in control and wants to develop a control chart to measure it. They collected 12 daily samples of 25 observations each with the following sample ranges: 18.5, 19.2, 20.4, 22.8, 26.9, 27.5, 24.5, 23.4, 21.2, 15.5, 17.7, 25.5. P +/- 310(100-p) VP(100-)'n UCL - +AR LCL --AR UCL - RD LCL - RD Sample Size n Control Limit Factor for Sample Mean A Control Limit Factor for Sample Range D D 2 3 4 5 10 15 20 25 Over 25 1.880 1.023 0.729 0.577 0.308 0.223 0.180 0.153 0.75(11 n) 0 0 0 0 0.223 0.348 0.414 0.459 0.45+.001n 3.267 2.575 2.282 2.116 1.777 1.652 1.586 1.541 1.55-.0015n Refer to Exhibit 17-13. Select the letter (a, b, c, d, or e) of closest answer from the list below and input it in the text box. What is the center line for the R chart? a. 18.50 b. 20.00 c. 21.00 d. 21.93 e. 25.00 a. Refer to Exhibit 17-13. Select the letter (a, b, c, d, or e) of closest answer from the list below and input it in the text box. What are the upper and lower control limits respectively for the R chart? 30.82; 9.18 b. 38.46; 1.54 21.54; 18.46 d. 40.00; 0.00 24.62; 15.38 c. e