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为了复习,巩固前面19讲介绍的基本概念与方法,请读者试做下列习题。答案将在下期刊出。一、选择题(选最佳答案)1 总体是指a 所调查的全部个体b 大量观测值的集体c 来源相同的部份个体d 特定来源的全部个体2 标准差常用于衡量a 样本与总体的差异b 两总体间差异c 两样本间差异d 个体差异大小3 随机抽样的要点或实质是a 每隔一定距离抽取一个个体b 对随机抽中的群体进行全面调查c 总体中的每一个体被抽中的机会相同d 先被调查对象分类,再在各类对象中随
In order to review and consolidate the basic concepts and methods introduced in the preceding 19 lectures, the reader is invited to try the following exercises. The answer will be in the next issue. First, the multiple-choice questions (choose the best answer) 1 the overall refers to a survey of all individuals b a large number of observations of the collective c from the same part of the individual d specific sources of all individuals 2 standard deviation is often used to measure a sample and the overall Difference b Difference between two populations c Difference between two samples d Individual difference size 3 The main point or essence of random sampling is that a individual b is selected at a certain distance to conduct a comprehensive investigation of the randomly selected population c. Each individual in the population is drawn The chances in the same d are classified first by the surveyed object and then in the various types of objects.