Why is variance defined as the expected value of difference squared?
21521
Motivation behind standard deviation?
49877
Expected value and indicator random variable
93521
Why is the expected value (mean) of a variable written using square brackets?
140611
Conditional Expectations and Variances
104875
what is the variance of a constant matrix times a random vector?
123850
Sample variance derivation
116209
Variance is the squared difference - why not to the 3, or 4 instead?
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?
4130
Variance of a bounded random variable
59274
Why do cost functions use the square error?
145136
When can we interchange the derivative with an expectation?
65259
Variance of Normal Order Statistics
128272
Expected value and variance of log(a)
62621
Expected value and variance of trace function
146616
Why is the squared difference so commonly used?
17107
Existence of the moment generating function and variance