A quality inspector took five samples, each with four observations (n = 4), of the length of time for glue to dry. All values are in minutes. Use this information to obtain three-sigma (i.e., z = 3) control limits. Construct three sigma mean and range charts. Determine if corrective action is needed. SAMPLE 2 3 4 5 Observation 1 2 3 4 12.11 12.10 12.11 12.08 12.15 12.12 12.10 12.11 12.09 12.09 12.11 12.15 12.12 12.10 12.08 12.10 12.09 12.14 12.13 12.12 X double bar R bar UCL x bar Show calculation: LCL x bar Show calculation: UCL R Show calculation: LCL R Show calculation: Using X bar, Is the process in control If not, what is the problem Using R, is the process in control If not, what is the