M2. Variance Flashcards
1
Q
Define variance
A
The variability/spread of the distribution given by the mean of the difference between the variable and its expectation.
By defintion, must be non-negative.
2
Q
Equations for variance
A
3
Q
Standard deviation and variance
A
Standard deviation is the square root of the variance.
4
Q
Formula for the variance for a uniform distribution
A
5
Q
Formula for variance of binary/indicator variables
A
