Or maybe I should say total square deviation instead. What do I mean by this?
或者我应该说,误差的平方和，这是什么意思？
The standard deviation is the square root of the variance.
标准差是方差的平方根。
The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
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