• 2022-06-15
    ‌假设样本 [img=114x23]1803da262270530.png[/img]来自正态总体[img=65x27]1803da262b62273.png[/img]。总体数学期望[img=11x18]1803da2633a9f63.png[/img]已知,则下列估计量中是总体方差[img=18x22]1803da263c1f9fe.png[/img]的无偏估计是()‌
    A: [img=116x60]1803da2649c29f7.png[/img]
    B: [img=131x60]1803da265448cc8.png[/img]
    C: [img=135x60]1803da265fade33.png[/img]
    D: [img=127x60]1803da266a4238c.png[/img]
  • 举一反三