Determination and Application of Sample Size Using Computer Mathematical Statistics and Standard Deviation

The determination of sample size is an important part of the sample survey. This paper determines the sample size mainly considering the influence of factors such as the population size, absolute error limit, confidence level and population variance. At the same time, this paper also considers the method of obtaining the value of the population variance. At last, we give a real example to show the method. The example is about the analysis of the drip irrigation belt about the sample size.