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一、知识要点三．总体和样本总体所考察对象的全体．个体总体中的每一个考察对象．样本从总体中抽取的一部分个体叫做总体的一个样本．样本客量样本中个体的数目叫做样本客量．2．平均数计算公式IIJ＊———I江’今不Q令“““今正。1（2）。＝x＋a＊J）江一一——辽＊回＊1＊X
First, knowledge points three. Overall and overall population of the sample Each object in the individual population. The part of the sample taken from the population is called a sample of the population. The number of individuals in a sample sample is called the sample size. 2. The calculation formula of the average number IIJ*————I Jiang’s current Q order is ““This is now. 1(2).=x+a*J) Jiang Yiyi—Liao* Hui*1*X