• 2022-05-26
    正态总体方差已知时,在小样本条件下,总体均值在[img=35x20]180391661527d1f.png[/img]置信水平下的置信区间可以写为()
    A: [img=91x50]180391661d1341d.png[/img]
    B: [img=89x43]18039166254f2a7.png[/img]
    C: [img=91x43]180391662dd8221.png[/img]
    D: [img=91x50]18039166364d251.png[/img]
  • 举一反三