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: Sample 1 2 3 4 5 6 789 10 1 12 13 14 15 9 17 1 20 15 15 18 19 16 17 19 12 14 1215 Range 5 10378 14 11149910 5 8012 19 17 11 20 15 15 18 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 16 17 18 19 20 21 22 23 24 25 Mean Range 5 10 5 311 1310975 4 17 12 18 20 2216 25 23 21 Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. b. On the control charts developed in part (a), plot the values from samples 16 through 25 and comment on whether the process is in control. Choose the correct R-chart for the data below O A. . . OD. UCLR UCLR 12 0 Li LC 15 17 19 21 23 15 17 19 21 23 25 15 17 19 21 23 15 17 19 21 23 25 Sample Number Sample Number Sample Number Sample Number Choose the correct x-chart for the data below. Choose the correct x-chart for the data below 27 27 27 UCL UCL a 15 17 19 21 23 25 Sample Number 15 17 19 21 23 25 Sample Number 15 17 19 21 23 25 Sample Number 15 17 19 21 23 25 Sample Number control. The entire process is c. In part (b), if you concluded that the process was out of control, would you attribute it to a drift in the mean, or an increase in the variability, or both? The process variability is | | statistical control and the process average is | statistical control. Therefore, the entire process is | control 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: Sample 1 2 3 4 5 6 789 10 1 12 13 14 15 9 17 1 20 15 15 18 19 16 17 19 12 14 1215 Range 5 10378 14 11149910 5 8012 19 17 11 20 15 15 18 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 16 17 18 19 20 21 22 23 24 25 Mean Range 5 10 5 311 1310975 4 17 12 18 20 2216 25 23 21 Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. b. On the control charts developed in part (a), plot the values from samples 16 through 25 and comment on whether the process is in control. Choose the correct R-chart for the data below O A. . . OD. UCLR UCLR 12 0 Li LC 15 17 19 21 23 15 17 19 21 23 25 15 17 19 21 23 15 17 19 21 23 25 Sample Number Sample Number Sample Number Sample Number Choose the correct x-chart for the data below. Choose the correct x-chart for the data below 27 27 27 UCL UCL a 15 17 19 21 23 25 Sample Number 15 17 19 21 23 25 Sample Number 15 17 19 21 23 25 Sample Number 15 17 19 21 23 25 Sample Number control. The entire process is c. In part (b), if you concluded that the process was out of control, would you attribute it to a drift in the mean, or an increase in the variability, or both? The process variability is | | statistical control and the process average is | statistical control. Therefore, the entire process is | control
