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10. The Money Pit Mortgage Company made some changes to the process and undertook a process capability study. The following data were obtained for 15 samples of size 5. Based on the individual observations, management estimated the process standard deviation to be 4.21 (days) for use in the process capability analysis. The lower and upper specification limits (in days) for the mortgage process times were 5 and 25. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Sample Mean Range 11 8 16 13 12 13 15 14 12 13 17 8 16 15 14 11 17 6 9 6 9 11 9 4 11 10 9 14 12 10 a. Calculate the process capability index and the process capability ratio values. b. Suppose management would be happy with three-sigma performance. Explain the results of the index and ratio. What conclusions is management likely to draw from the capability analysis? Can valid conclusions about the process be drawn from the analysis ? What remedial actions, if any, do you suggest that management take? C