• 2022-05-29
    设X1,X2,X3是来自总体X的简单随机样本,则下列统计量[img=551x43]1803da1393f5fdf.png[/img]中, 是总体均值的无偏估计量.
    A: [img=17x22]1803da139b3128e.png[/img]和[img=17x22]1803da13a44f014.png[/img]
    B: [img=17x22]1803da139b3128e.png[/img]和[img=17x22]1803da13b5b84de.png[/img]
    C: [img=17x22]1803da13a44f014.png[/img]和[img=17x22]1803da13b5b84de.png[/img]
    D: [img=17x22]1803da13d1416f1.png[/img],[img=17x22]1803da13a44f014.png[/img]和[img=17x22]1803da13b5b84de.png[/img]
  • 举一反三