• 2022-06-11
    抽取一个容量为100的随机样本,其均值为[img=53x18]1802e3e37ec7568.png[/img],标准差s=12.总体均值的95%的置信区间为()
    A: [img=72x20]1802e3e387b87e9.png[/img]
    B: [img=72x20]1802e3e390f0f5e.png[/img]
    C: [img=72x20]1802e3e39a97edd.png[/img]
    D: [img=72x20]1802e3e3a431d41.png[/img]
  • 举一反三