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 3.

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

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 Rare computed for each subgroup. After 30 subgroups, , 1 = 12,930 and QR = 1,230. Compute the values of the 3-sigma limits for the X and R charts, and estimate the value of 0 on the assumption that the process is in statistical control. b. In Prob.a the specified minimum strength for a weld is 370 lb. If the process is in statistical control, what can you say about its capability to meet this specification and about its current performance

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