Mean Population mean: μ=∑i=1NxiN\mu=\frac{\sum_{i=1}^N x_i}{N}μ=N∑i=1N​xi​​ Sample mean: xˉ=∑i=1nxin\bar{x}=\frac{\sum_{i=1...

用测量量、图表等方式来描述数据

变量的图表描述 分类变量 (Relative) Frequency Distribution 表格，左侧展示 classes/groups，右侧展示占比，relative frequency distribution: frequencyn×1...