====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 ---- * **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。 ---- * **置信区间的一般公式**:点估计 ± (临界值)(标准误) ---- * **Causes of the methodology**:There needs to be a greater chance that the estimate would be more accurate than a point estimate. ---- * **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. ---- * **The general formula for confidence intervals**:point estimate ± (critical value)(standard error)