Statistics 简明教程

Statistics - Pooled Variance (r)

合并方差/变化是用于评估两个自变量波动性的加权正态分布，其中均值在测试之间可能不同，但真实差异仍然如此。

Pooled Variance/Change is the weighted normal for assessing the fluctuations of two autonomous variables where the mean can differ between tests however the genuine difference continues as before.

Example

Problem Statement:

计算数字 1、2、3、4 和 5 的合并方差。

Compute the Pooled Variance of the numbers 1, 2, 3, 4 and 5.

Solution:

通过包括所有数字然后将其除以给定信息集合的数字总和来确定给定信息排列的正态（均值）。

Decide the normal (mean) of the given arrangement of information by including every one of the numbers then gap it by the aggregate include of numbers given the information set.

然后，将均值与信息集中给出的数字相减。

At that point, subtract the mean worth with the given numbers in the information set.

对每个时期的偏差进行平方以避开负数。

Square every period’s deviation to dodge the negative numbers.

现在使用下面方程式计算标准偏差

Now discover Standard Deviation utilizing the underneath equation

因此，合并方差 (r) =2.5

Hence, Pooled Variance (r) =2.5