Question: 1. a. Control charts for X and R are maintained on the shear strength in pounds of test spot welds. The subgroup size is

1. a. Control charts for X and R are maintained on the

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, -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.

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