• 2022-06-11
    抽取一个容量为100的随机样本,其均值为[img=53x18]1802e3f53ebf8e0.png[/img],标准差s=12.总体均值的95%的置信区间为()
    A: [img=72x20]1802e3f546d4fa2.png[/img]
    B: [img=72x20]1802e3f54efd1f5.png[/img]
    C: [img=72x20]1802e3f5569ebf7.png[/img]
    D: [img=72x20]1802e3f55e63664.png[/img]
  • 举一反三