Applied Statistics - 2.4 - Variance and Standard Deviation Flashcards
1
Q
What is Variance?
A
- σ² = Σ(x - x̄)² / n
- σ² = (Σx² / n) - (Σx/n)²
‘the mean of the squares minus the square of the mean’
2
Q
What is Standard Deviation
A
Square Root of Variance
3
Q
What is Variance in a Frequency Table?
A
(Σfx² / Σf) - (Σfx / Σf)²
‘the mean of the squares minus the square of the mean’
