它揭示了引起制程变异的因素，但不能确定是否允收一个有可能不良的批次。
Use Xbar and R charts to discover the factors that contribute to process variability. Shewhart charts cannot ensure against accepting poor or recallable lots.
它揭示了引起制程变异的因素，但不能确定是否允收一个有可能不良的批次。
Use Xbar and R charts to discover the factors that contribute to process variability. Shewhart charts cannot ensure against accepting poor or recallable lots.
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