• 2022-05-27
    设总体X服从正态分布 [img=109x27]1803380cad79e80.png[/img] ,其中[img=11x18]1803380cb5ecdbe.png[/img]未知,[img=18x22]1803380cbeb8f1e.png[/img]已知,[img=114x23]1803380cc78989b.png[/img]为样本,[img=99x60]1803380cd0cba0e.png[/img],则[img=11x18]1803380cb5ecdbe.png[/img]的置信水平为0.95的置信区间是
    A: [img=216x43]1803380ce2c1c39.png[/img]
    B: [img=216x43]1803380cedadab3.png[/img]
    C: [img=229x43]1803380cf8a2e1b.png[/img]
    D: [img=231x43]1803380d03ba95c.png[/img]
  • 举一反三