【判断题】总体指标是唯一的,而样本指标值是一个随机变量。( )
【单选题】He was elected ______ president of the company, and _____ news came , in fact, as ______ surprise. [ ]
【单选题】He______nothing about English before he came to our school, and nowhe_____story-books in English.
【判断题】在抽样推断中,总体指标值是确定的、唯一的,而样本指标值是一个随机变量。
【判断题】在抽样推断中,全及总体指标值是确定的、唯一的,而样本指标值是一个随机变量