Six Sigma:

Q. No. 5. Attached is the process capability report from Minitab. It is obtained for a technical support team of a software company in terms of the Turnaround time (TAT), measured in minutes. Go through it critically and answer the following questions: Process Capability Report for New TAT LSL USL Process Data LSL 60 Target USL 120 Sample Mean 91.1333 Sample N 30 StDev(Overall) 23.8439 StDevi Within) 17.0274 Overall Within Overall Capability Pp 0.42 PPL 0.44 PPU 0.40 Ppk 0.40 Cpm Potential (Within) Capability 0.59 0.61 CPU 0.57 Cpk 057 CPL 40 60 80 100 120 140 Performance Observed Expected Overall Expected Within PPM USL 100000.00 113014.75 45008.53 PPM Total 166666.67 208839.88 78751.31 a. What is the specification limits? b. Calculate the natural tolerance limits. c. What is your opinion about the process? Give compelling reasons. d. If you feel that the process is producing nonconforming items, then what is the proportion of nonconforming items is produced? Use the normal distribution concept and calculate Z1 and Z2 values. e. Use the six sigma conversion table in the slides. What is the sigma level of the process? f. If you feel that the process has to be improved, what will you do