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====区间估计====
====interval estimates====
  * **方法产生的原因**：相比点估计，需要有更大的机会使估计准确

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  * **区间估计的定义**：指明__一个区间__以及这个区间__覆盖总体未知参数的概率__的估计方法【相应的概率称为__置信度__1-α】。
  * **置信度与置信区间的关系**：  置信度越高，置信区间越宽。即对估计越有把握，估计就越不准确。

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  * **置信区间的一般公式**：点估计 ± (临界值)(标准误)

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  * **Causes of the methodology**：There needs to be a greater chance that the estimate would be more accurate than a point estimate.

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  * **The definition of interval estimates**：An estimate that specifies __an interval__ and __the probability of the overall unknown parameter__ covered by this interval【The corresponding probability is called __confidence level__ 1-α】。
  * **The relationship between confidence level and confidence intervals**：  The higher the confidence level is, the wider the confidence interval will be. The higher the confidence level, the wider the confidence interval. 

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  * **The general formula for confidence intervals**：point estimate ± (critical value)(standard error)