Observations on shear strength for 26 subgroups of test spot welds, each consisting of six welds, yield

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Observations on shear strength for 26 subgroups of test spot welds, each consisting of six welds, yield ∑x̅i = 10,980, ∑si = 402, and ∑ri 5 1074. Calculate control limits for any relevant control charts.
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