<p>设总体<img src="https://file.gaojiufeng.cn/learnAppQuestion/56/77/567733499b82033c3eff2ffb7fdff269.jpg" style="width: 100%;height: auto;">，<img src="https://file.gaojiufeng.cn/learnAppQuestion/8a/ef/8aef85645eb10008ef33c0a68780ecbf.jpg" style="width: 100%;height: auto;">已知,x1，x2，…，xn为来自总体X的一个样本,<img src="https://file.gaojiufeng.cn/learnAppQuestion/d3/03/d30393c0df5f7156c81c4e1a3992e130.jpg" style="width: 100%;height: auto;">为样本均值,则参数<img src="https://file.gaojiufeng.cn/learnAppQuestion/3a/e8/3ae850ec2e60378009d741521ce7dec4.jpg" style="width: 100%;height: auto;">的置信度为1-<img src="https://file.gaojiufeng.cn/learnAppQuestion/bc/4f/bc4fd0ed2cd4bd4a9689252c99389bb1.jpg" style="width: 100%;height: auto;">的置信区间为_____