设总体<img src="https://static.zxtiku.com/wangke/imgs/topic/59460969609b3c19790c7a2069ecee9c.jpg"/> ， <img src="https://static.zxtiku.com/wangke/imgs/topic/76d7da6b8fa43d9fb76d2aeeb975b6e4.jpg"/>已知，<img src="https://static.zxtiku.com/wangke/imgs/topic/f3f95988167036a37f0927069b779ff0.jpg"/>是未知参数，<img src="https://static.zxtiku.com/wangke/imgs/topic/6504e9bfda1c488c83d7e8613ccb4f87.jpg"/>是样本均值，<img src="https://static.zxtiku.com/wangke/imgs/topic/b0973a161e8390a1c5d6cd43bc7c04e2.jpg"/> 为标准正态分布函数，且<img src="https://static.zxtiku.com/wangke/imgs/topic/4a9a3eea1f2dbf00bb340581b34ad7f9.jpg"/> ．则 <img src="https://static.zxtiku.com/wangke/imgs/topic/6eb4056abcef40f99ab2865e3588dbac.jpg"/>的置信水平为0.95的置信区间是（）。