Statistics 简明教程

Statistics - Means Difference

平均差异（更确切地说，'平均值的差异'）是一个标准统计量，用于衡量临床试验中两组均值之间的绝对差异。它估计与对照组相比，实验干预平均改变结果的量。

The mean difference (more correctly, 'difference in means') is a standard statistic that measures the absolute difference between the mean value in two groups in a clinical trial. It estimates the amount by which the experimental intervention changes the outcome on average compared with the control.

Formula

其中——

Where −

  1. ${x_1}$ = Mean of group one

  2. ${x_2}$ = Mean of group two

  3. ${n}$ = Sample size

Example

Problem Statement:

Problem Statement:

下方列出两个舞蹈小组的数据。找出这两个舞蹈小组之间的平均差异。

There are 2 dance groups whose data is listed below. Find the mean difference between these dance groups.

Group 1

3

9

5

7

Group 2

5

3

4

4

Solution:

Solution: