Hi! I wanted to share the intuitions behind dividing the sample variance by n-1 instead of n. It relates to degrees of freedom and is not meant to be entirely rigorous. I hope this helps you understand it relatively easily without the need for complicated maths. Let me know what you think!
* Degrees of freedom (doF) are the number of dimensions needed to describe the data. Thus, taking the "average" would be dividing by doF.
