14、《学生体质健康标准》-|||-.0sim 69.9-|||-.0sim 74.90-|||-.0sim 79.9-|||-.0sim 75.90
26、某酸碱指示剂HIn的离解常数 =1times 10-5 ,则该指示剂的理论变色范围是:-|||-A .0sim 4.0-|||-B .0sim 8.0-|
(10)已知 sim t(n) ,则 ^2sim __
设sim N(0,2),则sim N(0,2),所服从的分布是()sim N(0,2),sim N(0,2),sim N(0,2),sim N(0,2),设则所
设随机变量sim N(0,1),sim N(0,1),且X与Y相互独立,则sim N(0,1).A.sim N(0,1)B.sim N(0,1)C.sim N(
设随机变量sim N(0,1),sim N(0,1),则sim N(0,1).A.1B.-1C.sim N(0,1)D.0设随机变量,,则.A.1B.-1C.D
设总体sim N((0,4)^2),sim N((0,4)^2)是来自总体sim N((0,4)^2)的一个样本。则sim N((0,4)^2)sim N((0
(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)
设sim b(2,p) sim pi (lambda ),sim b(2,p) sim pi (lambda )服从指数分布,sim b(2,p) sim pi
随机变量X,Y相互独立且sim N(0,1),sim N(0,1),则下列各式成立的是( )A.sim N(0,1)B.sim N(0,1)C.sim N