A- 1 Normal 1 No Spac. Heading 1 Heading 2 Heading 3 Heading 4 Paragraph Styles Problem 1 Chapter 3: Dr. Patel is concerned about the long wait times in his office. The following table presents six random observations for the patient waiting times over a period of 10 days. Observations (mins) 12 Day 5 18 35 30 12 38 29 a) Dr. Patel is willing to use three-sigma limits. Use the given data and the factors from Table 3.1 (page 110) to construct R-chart and x-chart. b) Is the process in statistical control? Explain. c) If patient surveys indicate that they are willing to wait between 10 and 30 minutes before seeing Dr. Patel, is the process capable of meeting this demand at the three-sigma level? FOR THE X-CHART Step 1 TABLE 3.1 data FACTORS FOR CALCULATING THREE SIGMA LIMITS FOR THE AND R-CHART Factor for UCL and LCL for Factor for LCL for X-Chart (A2) R-Chart (D3) 1.880 Size of Sample (m) Factor for UCL FOR R-Chart (D) 3.267 2.575 1.023 0.729 2.282 0.577 2.115 2.004 0.483 0.419 0.076 1.924 0.373 0.136 1.864 0.337 0.184 1.816 0.308 0.223 1.777