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分层随机抽样(给出各层数)求总方差的公式的一种表达形式及证明
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大魔法师 十一级
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Floor 1 Posted at: 5/23/25 22:06
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大魔法师 十一级
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Floor 2 Posted at: 5/23/25 22:06
啊啊是谁都对
总编 二十四级
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Floor 3 Posted at: 5/23/25 22:41
这个我应该在专门的概率统计教材(入门科普读物)中看到过……现在高中都这么复杂了?
 
star: 不是高中教的啦,我自己发现的
  7/3/25 8:48 Reply
三叶草
助理 六级
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Floor 4 Posted at: 8/12/25 8:14
唔咕,看来楼主是数学高手,膜拜。。。。。。。。
 
star: 糕手
  8/14/25 22:48 Reply
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Clicks: 1669 Replies: 5
Author: star
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Last reply time: 8/14/25 22:48
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