1.1本规程涵盖了计算随机样本中包含多少个单位的简单方法，以便以规定的精度估计大量材料或工艺生产的所有单位的质量测量。本规程将明确指出在随机样本覆盖的时间间隔内，估计某些属性的平均值或生产过程中产生的不合格项的比例所需的样本量。如果过程未处于统计控制状态，则结果对近期（未来）生产没有预测价值。 该实践处理了常见情况，即可以认为采样单元表现出单一（整体）可变性来源；它不处理多层次的可变性来源。

1.1 This practice covers simple methods for calculating how many units to include in a random sample in order to estimate with a prescribed precision, a measure of quality for all the units of a lot of material, or produced by a process. This practice will clearly indicate the sample size required to estimate the average value of some property or the fraction of nonconforming items produced by a production process during the time interval covered by the random sample. If the process is not in a state of statistical control, the result will not have predictive value for immediate (future) production. The practice treats the common situation where the sampling units can be considered to exhibit a single (overall) source of variability; it does not treat multi-level sources of variability.