Refers to the questionnaire survey sample in paper survey, and the size of the sample has a great influence on the accuracy of the survey. To some extent, "the more samples, the better", but after all, it is a sampling survey (sampling? Survey) is to use representative samples to represent the whole. If you can really do a census, of course, you don't need a sampling survey. Generally speaking, if the sample size is large, the sampling error of sampling survey will be reduced. However, how much sample size and sampling error should be chosen to meet the actual needs of the survey and effectively control the cost. Scientifically speaking, intuitively speaking, different research results can be obtained by using different numbers of samples. 5 1 survey network makes the survey easier and more convenient!