Statistics 简明教程

Statistics - Variance

方差定义为与均值的平方差的平均值。

A variance is defined as the average of Squared differences from mean value.

组合被以下函数定义和给出：

Combination is defined and given by the following function:

Formula

其中——

Where −

  1. ${M}$ = Mean of items.

  2. ${n}$ = the number of items considered.

  3. ${n_i}$ = items.

Example

Problem Statement:

Problem Statement:

求解以下数据的方差：{600, 470, 170, 430, 300}

Find the variance between following data : {600, 470, 170, 430, 300}

Solution:

Solution:

步骤 1：确定给定项目均值。

Step 1: Determine the Mean of the given items.

步骤 2：确定方差

Step 2: Determine Variance

因此，方差为 ${21,704}$ 。

As a result, Variance is ${21,704}$.