This is important, because it shows that looking at just the average is not enough, especially if your standard deviation is a large number.
这是很重要的，因为它说明了，仅查看平均值是不够的，特别是当您的标准偏差非常大的时候。
2
What the standard deviation really tells you is that some set of users were + or - the test average (or arithmetic mean).
标准偏差真正能够告诉您的是，某些用户是高于还是低于平均测试水平(或者算术含义)。
3
The selections of 150 for dimensional parameters and 4000 for the total deviation are designed to acquire the typical shaking motions of an average user.