设[img=172x25]180302c35b746e4.png[/img]为来自正态总体[img=54x25]180302c364a53c0.png[/img]的简单随机样本,[img=15x22]180302c36d4acf7.png[/img]为样本均值,[img=19x22]180302c37576740.png[/img]为样本方差,则( )
A: [img=104x27]180302c37d98b57.png[/img]
B: [img=97x27]180302c386b822a.png[/img]
C: [img=158x48]180302c38f9d3e0.png[/img]
D: [img=187x52]180302c39adaa75.png[/img]
A: [img=104x27]180302c37d98b57.png[/img]
B: [img=97x27]180302c386b822a.png[/img]
C: [img=158x48]180302c38f9d3e0.png[/img]
D: [img=187x52]180302c39adaa75.png[/img]
举一反三
- 设[img=172x25]180302c35b746e4.png[/img]为来自正态总体[img=54x25]180302c364a53c0.png[/img]的简单随机样本,[img=15x22]180302c36d4acf7.png[/img]为样本均值,[img=19x22]180302c37576740.png[/img]为样本方差,则( ) 未知类型:{'options': ['', '', '', ''], 'type': 102}
- 设总体X服从N(0,1),[img=113x23]180318bc2bf48df.png[/img]是来自总体的简单随机样本,其样本均值为[img=15x22]180318bc341ceee.png[/img],样本方差为[img=19x22]180318bc3c3bae3.png[/img],则() A: [img=93x27]180318bc43a5199.png[/img] B: [img=97x27]180318bc4b7f3cf.png[/img] C: [img=173x27]180318bc54417ee.png[/img] D: [img=95x27]180318bc5cd8886.png[/img]
- 设总体X服从N(0,1),[img=113x23]180318bef28473b.png[/img]是来自总体的简单随机样本,其样本均值为[img=15x22]180318befb13556.png[/img],样本方差为[img=19x22]180318bf0453dc9.png[/img],则( ) A: [img=93x27]180318bf0cd0359.png[/img] B: [img=97x27]180318bf152a1e0.png[/img] C: [img=173x27]180318bf1e9a281.png[/img] D: [img=95x27]180318bf27610c4.png[/img]
- 设X为正态总体,则其样本均值[img=15x22]1803da152e468cd.png[/img]与样本方差[img=19x22]1803da153830bf2.png[/img]相互独立。
- 设[img=114x23]1803bb164397e1b.png[/img]为来自总体N(0,1)的简单随机样本,[img=15x22]1803bb164c3ea3f.png[/img]为样本均值,[img=19x22]1803bb16546db12.png[/img]为样本方差,则 A: [img=104x27]1803bb165c4b200.png[/img] B: [img=97x27]1803bb1665a7f11.png[/img] C: [img=158x48]1803bb166e47974.png[/img] D: [img=187x69]1803bb167a89ab5.png[/img]