2.单选题-|||-比较下列化合物碳负离子的稳定性判断正确的-|||-是 ()-|||-O O O O O O-|||-ll-ll-|||-HCCHCH C2H
5.假设总体sim N(2(O)^2),现抽取容量16的样本,sim N(2(O)^2),sim N(2(O)^2)和sim N(2(O)^2)是对应的样本均值
4.已知 sim B(100,0.5) ,则 E(X)= __ ,D(X)= __ o-|||-E(2X-1)= ,D(2X-1)=
14.写出下列反应的机理:-|||-(1) O O-|||-O-|||-+C(H)_(2)(N)_(2)arrow □-|||-(2)-|||-OH (O)_
10、设随机变量 sim N(({H)_(1)}({O)_(1)},({O)_(1)}^2) sim N((mu )_(2),({sigma )_(2)}^2)
已知有如图反应:o o-|||-o CH2CH2COOC2H5-|||-(H)_(2)=CH-COO(C)_(2)(H)_(5) O-|||-A C2H5ONa
(判断)设总体sim N(2(O)^2),从X中抽得简单随机样本:sim N(2(O)^2)。记sim N(2(O)^2)为样本方差。为检验假设sim N(2(
设总体X与Y相互独立,sim N(3,({O)_(1)}^2) sim N(-2,({O)_(2)}^2),从X中抽得简单随机样本:sim N(3,({O)_(
(单选题)设总体sim N(0,1) sim N(2,4),分别从X和Y中随机抽取简单随机样本sim N(0,1) sim N(2,4)和sim N(0,1)
10.已知电极反应: _(3)Ag(O)_(4)+2(H)^++2(e)^-=!=!= (H)_(3)Ag(O)_(3)+(H)_(2)O-|||-(varph