Standard deviation formula

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manpreet Tuteehub forum best answer Best Answer 3 years ago

I'm having a lot of doubt on the formula of the standard deviation (in linear regression). My teacher and my syllabus say it's (for σxσx):

 

σx=(xx¯)2nσx=∑(x−x¯)2n

 

But my intuition tells me it's not. It tells me it should be:

 

σx=(xx¯)2nσx=∑(x−x¯)2n

 

It also worked in 1 exercise I made. I tried to google this trivial question, but if I look for standard deviation I get extremely long explanations as to what they are and a thousand different formulas.

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