<p>设x1，x2，…，xn是来自正态总体N(<img src="https://file.gaojiufeng.cn/learnAppQuestion/72/6d/726d1ac22ee44c05f8e8b153a54a5e3e.jpg" style="width: 100%;height: auto;">)的样本，<img src="https://file.gaojiufeng.cn/learnAppQuestion/61/cb/61cb83e6c25f38d4e3a68b90c72f5cec.jpg" style="width: 100%;height: auto;">，s2分别为样本均值和样本方差，则<img src="https://file.gaojiufeng.cn/learnAppQuestion/1f/40/1f403accf0402ce6738210e6c8876388.jpg" style="width: 100%;height: auto;">~</p>