抽样是一种选择调查对象的程序和方法。一般来说,对于由千差万别的个体所组成的总体,如果能对总体作全面的、普遍的调查,即将研究对象的整体无一例外地全部作为调查对象,其所得到的结果应该说最具有普遍意义、最能反映总体的特征。但是在很多情况下,实施这种整体调查非常困难,因此常常代之以抽样调查,所谓抽样调查,就是从研究对象的整体中选出一部分代表加以调查研究,然后用所得结果推论和说明总体的特征,这种从总体中选出一部分的过程就是抽样,选出的这部分代表称为样本。例如,我们想了解自改革以来青 Sampling is a procedure and method of selecting an investigation. Generally speaking, for a population composed of vastly different individuals, if the population can be investigated comprehensively and universally and all subjects of the study are to be surveyed as a whole without exception, the results obtained should be said to be the most prevalent Meaning, most reflect the overall characteristics. However, in many cases, it is very difficult to carry out such an overall survey. Therefore, it is often replaced by a sample survey. The so-called sample survey is a survey conducted by selecting some representatives from a whole group of subjects and using the results to infer and explain the overall Characteristics, the process of selecting a part of the population as a whole is sampling, and the selected part of the representative is called a sample. For example, we want to know how we have been since the reform started