5. Consider the control chart shown here. a. Does the pattern appear random? UCL Center line LCL U 5 10 15 20 b. Apply the Western Electric rules to the control chart presented in Question 5. Would these rules result in any out-of-control signals? 6. A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance requests that require a second call to complete the repair. Ten weeks of data are shown in below table. Does the process appear to be in control? If not, assume that assignable cause can be found for all points outside the control limits, and calculate the revised control limits. Sample Sample Number Number Size Nonconforming 1 100 10 2 100 15 3 3 100 31 4 100 18 5 100 24 6 100 12 7 100 23 8 100 15 9 100 8 10 100 8 5. Consider the control chart shown here. a. Does the pattern appear random? UCL Center line LCL U 5 10 15 20 b. Apply the Western Electric rules to the control chart presented in Question 5. Would these rules result in any out-of-control signals? 6. A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance requests that require a second call to complete the repair. Ten weeks of data are shown in below table. Does the process appear to be in control? If not, assume that assignable cause can be found for all points outside the control limits, and calculate the revised control limits. Sample Sample Number Number Size Nonconforming 1 100 10 2 100 15 3 3 100 31 4 100 18 5 100 24 6 100 12 7 100 23 8 100 15 9 100 8 10 100 8