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Regarding White Gaussian noise

Regarding White Gaussian noise

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I don’t understand why you multiplied std of sqrt(df.res_ret_ma_8) i.e  1.164 to 3? not to 1 and 2?

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365 Team
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Hey Ganesh, 
 
Thanks for reaching out!
So, I was trying to showcase what interval would include 3 standard deviations on each side. The 3 comes from the fact that for a Normal Distribution, 99.7% of all the data falls within this interval, so I wanted to showcase what the 3 deviations region would look like in this scenario. 
Hope this helps!
 
Best, 
365 Vik

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