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6.3 Working with Normally Distributed Variables As illustrated in the previous example, the 68.26-95.44-99.74 rule allows us to obtain useful informat 阅读全文
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6.2 Areas Under the Standard Normal Curve Property 4: Almost all the area under the standard normal curve lies between −3 and 3 Because the standard n 阅读全文
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6.1Introducing Normally Distributed Variables Why the word “normal”? Because, in the last half of the nineteenth century,researchers discovered that i 阅读全文
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数理统计与概率论的关系： 统计学：根据手中信息，猜猜桶里有啥？(样本归纳总结出总体)（样本估计总体（该总体是已经存在的总体）） 概率论：根据桶中信息，猜猜手里有啥？(总体对样本进行预测)（总体预测样本（该样本是未来的样本）） 作者：猴子链接：https://www.zhihu.com/questio 阅读全文
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5.3 Some Rules of Probability 如图所示，AorB是所有蓝色区域，所以P（AorB）=PA+PB，但是若非互斥事件，则不能直接相加： If you think of the regions as probabilities, the entire region enclo 阅读全文
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5.2Events The collection of all 52 cards—the possible outcomes—is called the sample space for this experiment Relationships Among Events More generall 阅读全文
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5.1Probability Basics uncertainty is inherent in inferential statistics，因为总是需要样本估计总体，The science of uncertainty is called probability theory.学习概率分布帮助我 阅读全文
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4.4 Linear Correlation 若由SxxSyySxy定义则为： 所以为了计算方便： 所以，可以明白的是，Sxx和Sx是不一样的！ 所以，t r is independent of the choice of units and always lies between −1 and 1 阅读全文