suppose $X_1,X_2,\ldots,X_n$ be random sample of $N(0,\sigma^2)$. how can I calculate UMVUE of parameter $(1-\sigma^2)^{-\frac{n}{2}}$
2026-03-30 17:53:57.1774893237
UMVUE of parameter $(1-\sigma^2)^{-\frac{n}{2}}$
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