1) a.) Control charts for X and R are maintained on the shear strength in pounds of test spot welds. The subgroup size is 3 . The values of X and R are computed for each subgroup. After 30 subgroups, X=12,930 and R=1,230. Compute the values of the 3-sigma limits for the X and R charts, and estimate the value of on the assumption that the process is in statistical control. b). In Problem A the specified minimum strength for a weld is 370lb. If the process is in statistical control, what can you say about its capability to meet this specification and about its current performance? R=1230. (a) Part 1: Compute the values of the 3 -sigma limits for the X chart on the assumption that the process is in statistical control. (UCL,LCL)forX=(455.22,339.18)(UCL,LCL)forX=(555.22,379.18)(UCL,LCL)forX=(655.22,309.18)(UCL,LCL)forX=(472.82,389.18) Compute the values for the 3-sigma limits for R chart on the assumption that the process is in statistical control. (UCL,LCL)forR=(455.22,339.18)(UCL,LCL)forR=(105.37,0)(UCL,LCL)forR=(655.22,239.18)(UCL,LCL)forR=(455.22,0) 1 (a) - Part 3: Estimate the value of on the assumption that the process is in statistical control. 21.2222.2223.2224.22 Capable to meet the given specfication Cannot meet the given specification Insufficient information Can meet only a few spefifications