Flashcards
Sample s.d and variance
Cards in this deck (5)
- 1s^2 = .....Σ(xi-x̄^2)^2 / n-1
(variance for sample) - 2s = .....root(Σ(xi-x̄) / n-1)
(s.d for sample) - 3Another to find s^2 is....s^2 = n/n-1 ((Σx^2/n) -x̄)
- 4An unbiased estimate is essentially a....Good estimate
- 5S is an unbiased estimator of ...σ