• 2022-05-28
    正态总体方差未知时,在小样本条件下,总体均值在[img=35x20]1803d9be88f11c1.png[/img]置信水平下的置信区间可以写为()
    A: [img=91x50]1803d9be91c6b5e.png[/img]
    B: [img=89x43]1803d9be9b2f96c.png[/img]
    C: [img=91x43]1803d9bea3639be.png[/img]
    D: [img=91x50]1803d9beabeb693.png[/img]
  • 举一反三