• 2022-06-03
    ​一个由n=50的随机样本,算得样本均值[img=53x18]1802e3e72fb6ed7.png[/img],总体标准差为6.总体均值[img=11x18]1802e3e738e5c26.png[/img]的95%置信区间为()‍
    A: [img=72x20]1802e3e74185f1a.png[/img]
    B: [img=72x20]1802e3e74ae8b38.png[/img]
    C: [img=72x20]1802e3e7539fbce.png[/img]
    D: [img=72x20]1802e3e75da301f.png[/img]
  • 举一反三