a. Calculate the centerline, the upper control limit (UCL), and the lower control limit (LCL) for the i chart if samples of 12 boxes are taken. (Round the value for the centerline to the nearest whole number and the values for the UCL and LCL to 3 decimal places.) Centerline Upper Control Limit Lower Control Limit b. Analysts obtain the following sample means after a recent inspection of the production process. Can they conclude that the process is under control? X1 = 16.0 12 = 16.2 13 = 16.1 14 = 17.6 15 = 17.0 R6 = 16.5 Yes, because all sample means lie within the control limits, and there is no systematic pattern. Yes, because some sample means lie outside the control limits. O No, because some sample means lie outside the control limits. O No, because even though all sample means lie within the control limits , there is a negative a. Calculate the centerline, the upper control limit (UCL), and the lower control limit (LCL) for the i chart if samples of 12 boxes are taken. (Round the value for the centerline to the nearest whole number and the values for the UCL and LCL to 3 decimal places.) Centerline Upper Control Limit Lower Control Limit b. Analysts obtain the following sample means after a recent inspection of the production process. Can they conclude that the process is under control? X1 = 16.0 12 = 16.2 13 = 16.1 14 = 17.6 15 = 17.0 R6 = 16.5 Yes, because all sample means lie within the control limits, and there is no systematic pattern. Yes, because some sample means lie outside the control limits. O No, because some sample means lie outside the control limits. O No, because even though all sample means lie within the control limits , there is a negative