设总体X和Y都服从正态分布N(0,σ^2),X1,…,Xn和Y1,…,Yn分别是总体X和Y的样本且容量都为n,其样本均值和样本方差为X ̅,SX^2和Y ̅,SY^2,则有
A: [img=125x27]1802da1382bf510.png[/img]
B: [img=154x27]1802da138b3089b.png[/img]
C: [img=169x54]1802da1395da0af.png[/img]
D: [img=162x52]1802da13a0db833.png[/img]
A: [img=125x27]1802da1382bf510.png[/img]
B: [img=154x27]1802da138b3089b.png[/img]
C: [img=169x54]1802da1395da0af.png[/img]
D: [img=162x52]1802da13a0db833.png[/img]
举一反三
- 设总体X和Y都服从正态分布N(0,σ^2),X1,…,Xn和Y1,…,Yn分别是总体X和Y的样本且容量都为n,其样本均值和样本方差为X ̅,SX^2和Y ̅,SY^2,则有 A: [img=125x27]1803805eed02985.png[/img] B: [img=154x27]1803805ef9e7c65.png[/img] C: [img=169x54]1803805f04f0cdc.png[/img] D: [img=162x52]1803805f113e800.png[/img]
- 设总体X和Y都服从正态分布N(0,σ^2),X1,…,Xn和Y1,…,Yn分别是总体X和Y的样本且容量都为n,其样本均值和样本方差为X ̅,SX^2和Y ̅,SY^2,则有 A: [img=125x27]1803a467139309b.png[/img] B: [img=154x27]1803a4671c3dc5d.png[/img] C: [img=169x54]1803a46726c09a7.png[/img] D: [img=162x52]1803a46731f454b.png[/img]
- 设总体X和Y都服从正态分布N(0,σ^2),X1,…,Xn和Y1,…,Yn分别是总体X和Y的样本且容量都为n,其样本均值和样本方差为X ̅,SX^2和Y ̅,SY^2,则有 A: [img=125x27]1802da134cf8e02.png[/img] B: [img=154x27]1802da1356c4575.png[/img] C: [img=169x54]1802da136253bb4.png[/img] D: [img=162x52]1802da136d329de.png[/img]
- 设总体X和Y都服从正态分布N(0,σ^2),X1,…,Xn和Y1,…,Yn分别是总体X和Y的样本且容量都为n,其样本均值和样本方差为X ̅,SX^2和Y ̅,SY^2,则有 A: [img=125x27]180399f4684196b.png[/img] B: [img=154x27]180399f474d3cef.png[/img] C: [img=169x54]180399f48057553.png[/img] D: [img=162x52]180399f48bd0b79.png[/img]
- 设总体X和Y都服从正态分布N(0,σ^2),X1,…,Xn和Y1,…,Yn分别是总体X和Y的样本且容量都为n,其样本均值和样本方差为X ̅,SX^2和Y ̅,SY^2,则有 A: [img=125x27]18036b5591d553d.png[/img] B: [img=154x27]18036b559ad7ad3.png[/img] C: [img=169x54]18036b55a69a8f1.png[/img] D: [img=162x52]18036b55b12aaf8.png[/img]