1.1 本规程涵盖了取样计划的设计，该计划用于获取样品，以测定油脂棉、粗梳毛、粗梳毛、石榴石毛、羊毛顶部和中间产品以及粗纱的含水量。 1.2 给出了指定采样单位、计算实现预选精度和置信水平所需的采样单位数量，或者根据测试样本的可变性计算平均值的置信限的方向。 注1: 本设计抽样方案的实施规程旨在与试验方法结合使用 D1576 或试验方法 D2462 . 实践中涵盖了原毛取样以确定存在的清洁羊毛纤维 D1060 . 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本推荐规程提供了第节中所示各种形式羊毛的取样说明 1. ，以便对样本平均值和总体平均值之间的关系作出正确的概率陈述。如果这些陈述是正确的，那么所陈述的某些条件必须成立。 5.2 本推荐规程要求进行有意的随机化操作，以使所有潜在的采样单元具有大致相同的被采样机会，并且不剥夺任何采样单元被采样的机会。 5.3 在任何情况下，如果关于批次内采样单位可变性的信息不足，则给出了计算样本平均值置信限的指示，以便仍然可以做出正确的概率陈述。

1.1 This practice covers the design of a sampling plan to be used to obtain samples for the determination of the moisture content of grease wool, scoured wool, carded wool, garnetted wool, wool top and intermediate products, and rovings. 1.2 Directions are given for the designation of sampling units, calculation of the number of sampling units required to achieve a preselected precision and confidence level or, alternatively, for calculating the confidence limits for the mean based on the variability of the sample tested. Note 1: This practice for devising a sampling plan is intended for use in connection with Test Method D1576 or Test Method D2462 . The sampling of raw wool for the determination of clean wool fiber present is covered in Practice D1060 . 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This recommended practice furnishes directions for the sampling of wool of the various forms indicated in Section 1 , in order that correct probability statements may be made about the relationship between the sample mean and the population mean. If these statements are to be correct, certain conditions, which are stated, must hold. 5.2 This recommended practice requires that a deliberate act of randomization be performed so that all potential sampling units have approximately the same chance of being taken and no sampling unit is deprived of its chance of being taken. 5.3 In any case where insufficient information about the variability of the sampling units within the lot is available, directions are given for calculating confidence limits for the sample mean so that a correct probability statement can still be made.