调查总体 meaning in English

survey population
universe

Its purpose is to estimate the parameter of population , offer decision service and meet the social demand
其目的是通过对样本数据的加工处理，估算调查总体参数，提供决策服务，满足社会需求。
Note : the average issue reading rate per issue means that the proportion of readers per issue in the overall investigated ones for one magazine during certain time or period , which shows the magazines ' coverage ability to readers , is the key reading standard
说明：平均每期阅读率是指某杂志在某一时间或时间段平均每期的读者人数在调查总体中所占的比例，反映了该杂志的读者覆盖能力，是杂志的核心阅读指标。