• 2022-06-15
    假设样本[img=114x23]1803da23f797fb8.png[/img]来自正态总体[img=65x27]1803da24005546b.png[/img]。总体数学期望[img=11x18]1803da2409ff5a5.png[/img]已知,则下列估计量中是总体方差[img=18x22]1803da2413dfdb7.png[/img]的无偏估计是()
    A: [img=108x60]1803da24212d65c.png[/img]
    B: [img=133x60]1803da242c31456.png[/img]
    C: [img=135x60]1803da243650d15.png[/img]
    D: [img=143x60]1803da244353609.png[/img]
  • 举一反三