Why are these formulas for the variance equal?
68116
How to derive this version of variance formula
134425
Why is homogeneity of variance so important?
102138
Why does $\sqrt{x^2}$ seem to equal $x$ and not $|x|$ when you multiply the exponents?
36606
Why the standard deviation of the sample mean is calculated as $\frac{\sigma}{\sqrt{n}}$?
10730
Proof that regression residual error is an unbiased estimate of error variance
20038
Conceptual questions: Variance of a process
65259
Variance of Normal Order Statistics
85588
How variance is defined?
48618
Why is there a difference between a population variance and a sample variance
98101
why this product is no more than the product of the two mean values?
110894
Does the variance of a sum equal a double sum of covariances?
99062
Intuitive explanation of variance and moment in Probability
9665
Proof of the independence of the sample mean and sample variance
8860
Why square the difference instead of taking the absolute value in standard deviation?
124392
Variance of a distribution's product with itself
17809
How come such different methods result in the same number, $e$?
30283
What is the demonstration of the variance of the difference of two dependent variables?