PROOF 199
Prove.
The sample variance divides by n−1
On a probability space.
Definition D1
X₁, …, Xₙ are mutually independent and identically distributed: E(Xᵢ) = μ, Var(Xᵢ) = E[(Xᵢ − μ)²] = σ². Define the sample mean X̄ = (X₁ + ⋯ + Xₙ)/n.
Proof.
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