• 2022-05-27
    设总体X服从正态分布 [img=109x27]1803da24edd8da7.png[/img],其中[img=11x18]1803da24f6dffd9.png[/img]未知,[img=18x22]1803da24ff8a925.png[/img]已知,[img=114x23]1803da2508525ac.png[/img]为样本,[img=99x60]1803da2510aa355.png[/img],则[img=11x18]1803da24f6dffd9.png[/img]的置信水平为0.95的置信区间是
    A: [img=216x43]1803da25240b968.png[/img]
    B: [img=216x43]1803da252fbb61f.png[/img]
    C: [img=231x43]1803da253bc1c83.png[/img]
    D: [img=231x43]1803da254778c45.png[/img]
  • 举一反三