1663统计简单derivationshort
Sample Size for a Stable Variance Estimator
题目
Under a normal model, the unbiased sample variance satisfies Var(S^2) = 2 sigma^4 / (n-1). What is the smallest n for which the standard deviation of S^2 is at most 0.5 sigma^2?
解题计时
0:00
提交作答时记录，用于后续平均用时统计。
你的答案