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请教大神一个简单随机样本的问题

问了好多人,都不清楚,希望给解解惑。数理统计中定义的容量为n的简单随机样本中,每一个元素也是一个随机变量,我不理解的是这些元素X1,X2....Xn都是对同一个总体的抽样,为什么不能看成是一个随机变量呢?比如我有10万个身高的数据,我想通过抽样来判断总体的特性,我每次抽50个数据,抽100次,为什么我不能把抽取的50个数据看作是一个随机变量的50次取值?

请教大神关于R和python到底对于数据科学哪个好的问题

今天翘班,来到图书馆想找些机器学习方面的书入门,偶然的发现您的这本书,大致翻了下,感觉很纠结,因为我之前花了一些时间在机器学习通过python入门的道路上,也在家搭好了python的环境,我看市面上大多书籍都是介绍如何使用python的,所以就想问一下,如果想学机器学习的话,到底这两种语言哪个更好一点呢?这两种语言到底有什么区别,在机器学习方面?抱歉在这里提问题,不知道该在哪里联系到您

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