论文部分内容阅读
现场调查样本代表性问题取决于以下几个方面:①根据研究目的确定的研究对象及范围;②根据检验所需精度及有关参数估计样本大小;③抽样时遵循随机化及齐同对比等原则;④进行小规模的实验取得经
The representative sample of the on-site survey depends on the following aspects: 1 The research object and scope determined according to the purpose of the study; 2 The sample size is estimated based on the required accuracy of the test and related parameters; 3 The principles of randomization and homogeneous comparison are followed when sampling; 4 Conduct small-scale experiments to obtain