Estimate the total population of Heshun county in year 1998 according to the population data of 64 sample villages in the sampling investigation of Heshun county
Implementation steps:
- Calculate the mean of 10 towns with the formula of the s tratified sampling respectively, and the proportion that the administrative village size of each town account for the total size of the administrative village (the sum of the administrative village of the total town in Heshun County ) of Heshun county is taken as the weight, then do the weighted sum, the result is the estimated total population.
- Estimate the sampling accuracy with the formula of the s tratified sampling.
Calculate:
-
The estimated total population of Heshun county:
- Sampling accuracy :
；
Layer weight 
(It is the proportion that the administrative village size of each town account for the total size of the administrative village of Heshun county) ；
Population mean 
；
Variance 
(the variance of the estimation of the total population mean 
).