Statistics 简明教程
Statistics - Standard Deviation
标准差是所有项目离平均值的平方差的平均值的平方根。在符号中用 ${\sigma}$ 表示。
Standard deviation is the square root of the average of squared deviations of the items from their mean. Symbolically it is represented by ${\sigma}$.
我们准备讨论为以下三种类型序列计算 Standard deviation 的方法：
We’re going to discuss methods to compute the Standard deviation for three types of series:
Individual Data Series
当数据是以个体为基础给出时。以下是关于个体序列的一个例子：
When data is given on individual basis. Following is an example of individual series:
Items |
5 |
10 |
20 |
30 |
40 |
50 |
60 |
70 |