华中科技大学出品的应用语言学与统计学的研究方法课程完整精品版SPSS数据分析数据挖掘全套英文PPT课程（共26页） 9 样本检验.ppt

单样本t检验 独立样本t检验 配对样本t检验 单因素方差分析 Normal distribution and sampling distribution Normal distribution is made up of individual scores. Sampling distribution is composed of group means. With more groups means, a curve of their distribution would be symmetric. This symmetric curve is not called a normal distribution but rather a sampling distribution of means A sampling distribution is the distribution of a sample statistic that would be obtained if all possible samples of the same size were drawn from a given population.