In the standard deviation formula, why do you divide by n before taking the square root?
138529
Why is the standard deviation defined as sqrt of the variance and not as the sqrt of sum of squares over N?
140652
Why does dividing a vector by its norm give a unit vector?
94136
Why is variance squared?
62331
Undesired spacing before \sqrt[n]{x}, proper way to fix?
45364
Why is there a $2$ at the denominator of the mean squared error function?
68116
How to derive this version of variance formula
128647
Calculating square roots using the recurrence $x_{n+1} = \frac12 \left(x_n + \frac2{x_n}\right)$
105110
Why does $\sqrt{n\sqrt{n\sqrt{n \ldots}}} = n$?
49750
Proof of the square root inequality $2\sqrt{n+1}-2\sqrt{n}<\frac{1}{\sqrt{n}}<2\sqrt{n}-2\sqrt{n-1}$
6707
Why there is a $\frac{1}{2}$ in the distance formula $d=\frac{1}{2}at^2$?
31907
Why does N[1.000 01, 10] return 1.00001, but N[1.000 001, 10] returns only 1.?
98456
n & (n-1) what does this expression do?
8860
Why square the difference instead of taking the absolute value in standard deviation?
120743
For Riemann sums involving square roots, why do we let $c_{i} = \frac{i^{2}}{ n^{2}}$?
55994
Why do statisticians like "$n-1$" instead of "$n$"?
84930
How to justify $\phi(n) \ge \sqrt{n}$
81308
What is the reasoning behind standardization (dividing by standard deviation)?