Why is $(x_i-\bar{x})^2$ in the formula for variance as opposed to $|x_i-\bar{x}|$?
94136
Why is variance squared?
123850
Sample variance derivation
81301
What is the difference between N and N-1 in calculating population variance?
98064
Why is the sampling distribution of variance a chi-squared distribution?
146956
In simple linear regression, where does the formula for the variance of the residuals come from?
45364
Why is there a $2$ at the denominator of the mean squared error function?
48618
Why is there a difference between a population variance and a sample variance
46044
Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$
96265
Why does $x= \frac{1}{2}(z+\bar{z}) = \frac{1}{2}(z+\frac{r^{2}}{z})$ on the circle?
111742
Variance of sample variance?
3401
The variance of linear regression estimator $\beta_1$
27788
Why is the expected value $E(X^2) \neq E(X)^2$?
85351
Standard Deviation. Why do we take the square root of the entire equation?
143742
Variance of sum of random number of random variables (Cambridge University Worksheet)
46380
Variance (different definitions)
111749
Mean and variance of Squared Gaussian: $Y=X^2$ where: $X\sim\mathcal{N}(0,\sigma^2)$?
101627
Variance of product of 2 independent random vector