• 2022-05-27
    设总体X服从正态分布 [img=109x27]1803da22a21d0a8.png[/img] ,其中[img=11x18]1803da22ab3a646.png[/img]未知,[img=18x22]1803da22b3d84a5.png[/img]已知,[img=114x23]1803da22bc5330b.png[/img]为样本,[img=99x60]1803da22c57f2f4.png[/img],则[img=11x18]1803da22ab3a646.png[/img]的置信水平为0.95的置信区间是
    A: [img=216x43]1803da22db44778.png[/img]
    B: [img=216x43]1803da22e68fbcb.png[/img]
    C: [img=229x43]1803da22f1ce6f5.png[/img]
    D: [img=231x43]1803da22fdbac7e.png[/img]
  • 举一反三