• 2022-06-11
    抽取一个容量为100的随机样本,其均值为[img=53x18]1803946abcfcc91.png[/img],标准差s=12.总体均值的95%的置信区间为()
    A: [img=72x20]1803946ac471926.png[/img]
    B: [img=72x20]1803946acd2a3ef.png[/img]
    C: [img=72x20]1803946ad5b7126.png[/img]
    D: [img=72x20]1803946ade0e198.png[/img]
  • 举一反三