设X1，X2，…，Xn是来自正态总体N(0，σ2)的样本，，则D(S2)=( )．

单项选择题

设X₁，X₂，…，X_n是来自正态总体N(0，σ²)的样本，，则D(S²)=( )．
A． B． C． D．

A.174.24.96:6088/Latex/latex.action?latex=U14yPVxmcmFjezF9e24tMX1cc3VtX3tpPTF9XntufShYX3tpfS1cYmFye1h9KV4y'
B.

C.D.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7z4NeNH17bn0%3D'
E.F.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7Ms%2BDXjR9e259'
G.H.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7z4NeNH17bi0xfQ%3D%3D'
I.J.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7Ms%2BDXjR9e24tMX0%3D'

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