In this example, the variance is total variance, and management often needs more detailed information.
上例中的成本差异是差异的总值, 管理中有时需要更详细的数据.
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The calculation formulas of total variance and freedom degrees are different when the variances are homogeneityhomogeneity.
在两种不同的情况下,计算总方差与自由度所用的公式是不同的.
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