Suppose that the process mean shifts to 1,011 in Problem 8.
a. What is the probability that the X chart will not indicate an out-of-control condition from a single subgroup sampling? (This is precisely the Type 2 error.)
b. What is the probability that the X chart will not indicate an out-of-control condition after sampling 20 subgroups?
Control charts for and R are maintained on the shear strength of spot welds. One hundred observations divided into subgroups of size five are used as a baseline to
Using this information, compute the values of three-sigma limits for both charts.
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