Authors: Sabiou Inoua
This short paper establishes one more formula for the variance. Consider a random variable X whose possible values are x1, …, xn with probabilities p1, …, pn of occurring, respectively. Pick two of these possible values successively (each xi having the probability pi of being chosen). Compute the difference between the two chosen values. Square the difference. Claim: you are expected to get (twice) the variance of X. This formula makes the variance appear an even more natural measure of dispersion than usually thought.
Comments: 2 Pages.
[v1] 2013-06-05 07:25:19
Unique-IP document downloads: 120 times
Add your own feedback and questions here:
You are equally welcome to be positive or negative about any paper but please be polite. If you are being critical you must mention at least one specific error, otherwise your comment will be deleted as unhelpful.