One is faced with a decision to purchase parts from three suppliers.
The part you need has a specification of 15.00 +/- 0.09 mm.
The SPC studies done by suppliers indicate that their processes were in statistical control with the following parameters:
Supplier 1: X-double bar is 15.00, Sigma-x is 0.03
Supplier 2: X-double bar is 15.05, Sigma-x is 0.022
Supplier 3: X-double bar is 14.95, Sigma-x is 0.015
Which supplier would you select?

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