【单选题】【消耗次数:1】
I should think they have done it ________, to avoid paying you the money.
with purpose
on purpose
in purpose
to purpose
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相关题目
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随机题目
【单选题】 若两个随机变量X,Y相互独立,则它们的连续函数g(x)和h(y)所确定的随机变量( ).
①  不一定相互独立
②  一定不独立
③  也是相互独立
④  绝大多数情况下相独立
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/DE0B303CD9B0D9E07BAA348D594E6EEE.png title=题干.png alt=题干.png width=805 height=84 style=width: 805px; height: 84px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/1E630CD3D1616B1241329F59B82EC103.png style= title=1.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/DF9D30A20651AFBE6C69A70B1592EC9F.png title=3.png style=white-space: normal;/>
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【单选题】 将一枚硬币连抛两次,则此随机试验的样本空间为( )
①  {(正,正),(反,反),(一正一反)}
②  {(反,正),(正,反),(正,正),(反,反)}
③  {一次正面,两次正面,没有正面}
④  {先得正面,先得反面}
【单选题】 设A,B为随机事件,P(AB)=0则( ).
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④  P(A)=0或P(B)=0
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②  <img src=https://huaweicloudobs.ahjxjy.cn/34C22D96272AD7104DC84C24FA15EE4A.png title=1.png style=white-space: normal;/>
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④  <img src=https://huaweicloudobs.ahjxjy.cn/840AC675A875D4E7DEF7E0BBCA86945F.png title=4.png style=white-space: normal;/>
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/83BA619E1FE88B6E27AD3943DA5D59FF.png title=题干.png alt=题干.png width=587 height=55 style=width: 587px; height: 55px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/69200ED34BFECA11518B3A6D5686907C.png style=width: 412px; height: 51px; title=1.png width=412 height=51/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/6F7FD729388E94AAABFAD8B23B63220A.png title=3.png style=white-space: normal; width: 482px; height: 55px; width=482 height=55/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/CE6D788FA9FC5249DFB05C614EEC6B57.png title=2.png style=white-space: normal; width: 794px; height: 45px; width=794 height=45/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/A011CBD202E3451AD8FDE46016DD8F04.png title=4.png style=white-space: normal; width: 771px; height: 45px; width=771 height=45/>
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/F1324B7F7F61B079B2100E0BC20B6007.png title=题干.png alt=题干.png width=843 height=50 style=width: 843px; height: 50px;/>
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②  <img src=https://huaweicloudobs.ahjxjy.cn/E99D92E6781DE3E637F6D69B618BB899.png title=1.png style=white-space: normal; width: 435px; height: 42px; width=435 height=42/>
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【单选题】 关于检验水平a的设定,下列叙述错误的是( ).
①  a的选取本质上是个实际问题,而非数学问题
②  在检验实施之前,a应是事先给定的,不可擅自改动
③  a即为检验结果犯第一类错误的最大概率
④  为了得到所希望的结论,可随时对a的值进行修正
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①  <img src=https://huaweicloudobs.ahjxjy.cn/4AFE1C1A40ACE94179DA486477223918.png style= title=1.png/>
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【单选题】 若Cov(X,Y)=0,则下列结论中正确的是( ).
①  X,Y独立
②  DXY=DXDY
③  D(X+Y)=DX+DY
④  D(X-Y)=DX-DY