• 2022-05-26
    设总体[img=216x27]1802dacf85385c9.png[/img]是总体X的简单随机样本,[img=15x22]1802dacf8cf3874.png[/img]是样本均值,[img=19x22]1802dacf94efd73.png[/img]是样本方差,则[img=119x27]1802dacf9d73d9d.png[/img]