Homework: M2 Assignment 2: Variables SPC and Process Capabil Question 1, Problem 6 Part 1 of 6 2 3 4 Sample 1 Mean Range 6 10 3 7 21 17 11 20 The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen samples of five completed mortgage transactions each were taken during a period when the process was believed to be in control. The times to complete the transactions were measured. The means and ranges of the mortgage process transaction times, measured in days, are as follows: 5 15 8 6 7 8 15 9 18 19 16 10 11 12 13 14 17 19 12 14 12 15 15 14 11 14 9 9 11 5 8 10 12 16 17 18 19 15 17 12 18 7 10 5 3 Subsequently, samples of size 5 were taken from the process every week for the next 10 weeks. The times were measured and the following results obtained: Sample Mean Range Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. a. Construct the control charts for the mean and the range, using the original 15 samples. Set up the R-chart by specifying the center line and three-sigma control limits below. (Enter your responses rounded to two decimal places.) R-chart UCLR HW Score: 0%, 0 of 52 points O Points: 0 of 16 LCLR 20 21 22 23 24 25 20 21 16 25 23 21 11 12 10 9 7 5 = D = Save = Reference Size of Sample Factor for UCL and LCL (n) for x-chart (A) 23 4 5 Factors for calculating three-sigma limits for the x-chart and R-chart Factor for LCL for R-Chart (D3) 678910 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 Print LULR= 0 0 0 0 0.076 0.136 0.184 0.223 Done Factor for UCL for R-Chart (D4) 3.267 2.575 2.282 2.115 2.004 1.924 1.864 1.816 1.777 - X