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#### Elementary Probability Theory，Kai Lai Chung

PS：记得很清楚这书有一个很有趣的例子——如何计算明天太阳升起的概率，亮瞎眼233

#### Statistical Inference, Casella

Definition9.1.1
An intervel estimate of a real-valued parameter $\theta$ is any pair of functions, $L(x_{1}, \cdots, x_{n})$ and $U(x_{1}, \cdots, x_{n})$, of a sample that satisfy $L(\mathbf{x}) \le U(\mathbf{x})$ for all $\mathbf{x} \in \mathbf{\chi}$. If $\mathbf{\chi} = \mathbf{x}$ is observed, the inference $L(\mathbf{x}) \le \theta \le U(\mathbf{x})$ is made. The random intervel $[L(\mathbf{X},U(\mathbf{X}]$ is called an intervel estimate.