这是名字 · 2025年06月22日
NO.PZ2024120401000009
问题如下：
An experiment yields the following data:
It is hypothesized that the data come from a uniform distribution, U(0, b). What are the unbiased estimators of the mean and variance?
选项：
A.0.39 0.08
B.0.45 0.086
C.0.39 0.086
D.0.45 0.086
解释：
The sample mean is already unbiased:
For the variance:
这题用计算器算了一下，感觉想到个很奇怪的方式不知道对不对。用计算器可以计算出样本标准差和总体标准差。题目要求解总体方差的无偏估计，其实就是在求样本方差。所以直接用计算器的样本方差结果平方就可以了。这么理解对吗。
NO.PZ2024120401000009问题如下 experiment yiel the following ta:It is hypothesizeththe ta come from a uniform stribution, U(0, b). Whare the unbiaseestimators of the meanvariance? A.0.39 0.08B.0.45 0.086C.0.39 0.0860.45 0.086 The sample meis alrea unbiaseFor the variance: 为什么用计算器计算结果会有偏差
NO.PZ2024120401000009 问题如下 experiment yiel the following ta:It is hypothesizeththe ta come from a uniform stribution, U(0, b). Whare the unbiaseestimators of the meanvariance? A.0.39 0.08 B.0.45 0.086 C.0.39 0.086 0.45 0.086 The sample meis alrea unbiaseFor the variance: 除了明确要无偏估计的样本方差，除以n-1而不是n的计算方式会在frm其他题目里面挖坑吗？感觉遇到的很少
NO.PZ2024120401000009 问题如下 experiment yiel the following ta:It is hypothesizeththe ta come from a uniform stribution, U(0, b). Whare the unbiaseestimators of the meanvariance? A.0.39 0.08 B.0.45 0.086 C.0.39 0.086 0.45 0.086 The sample meis alrea unbiaseFor the variance: 在哪一个单元的section里面
NO.PZ2024120401000009问题如下 experiment yiel the following ta:It is hypothesizeththe ta come from a uniform stribution, U(0, b). Whare the unbiaseestimators of the meanvariance? A.0.39 0.08B.0.45 0.086C.0.39 0.0860.45 0.086 The sample meis alrea unbiaseFor the variance: 请问这个uniform stribution在哪个知识点啊，没太看懂
NO.PZ2024120401000009 问题如下 experiment yiel the following ta:It is hypothesizeththe ta come from a uniform stribution, U(0, b). Whare the unbiaseestimators of the meanvariance? A.0.39 0.08 B.0.45 0.086 C.0.39 0.086 0.45 0.086 The sample meis alrea unbiaseFor the variance: 0.080是怎麼算出來的？
