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１９９５年全国血吸虫病抽样调查，采取分层整群随机抽样方法［１］进行抽样，根据调查资料推算居民血吸虫感染率及其抽样误差，是一项必要的工作。居民感染率是反映血吸虫病流行程度的重要指标，抽样误差是反映抽样方法是否达到了设计要求的评价指标。现应用统计学有关概念，?
In 1995, the national schistosomiasis sampling survey was conducted by sampling the stratified cluster random sampling method [1]. Based on the survey data, it was necessary to calculate the resident schistosome infection rate and its sampling error. Residents infection rate is an important indicator of the prevalence of schistosomiasis, sampling error is reflected in the sampling method to meet the design requirements of the evaluation index. Now apply the concept of statistics ,?