【单选题】
总体均值<imgwidth="12"height="20"v:shapes="_x0000_i1240"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image307.png">的区间估计中,下面说法中,正确的是()
①
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1241"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">一定时,样本容量增加,则置信区间的长度变长
②
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1242"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">一定时,样本容量增加,则置信区间的长度变短
③
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1243"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">变小,则置信区间的长度变短
④
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1244"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">变大,则置信区间的长度变短
【单选题】
从一批产品中随机抽两次,每次抽1件。以A表示事件“两次都抽得正品”,B表示事件“至少抽得一件次品”,则下列关系式中,正确的是()
①
<imgwidth="46"height="17"v:shapes="_x0000_i1077"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image102.png">
②
<imgwidth="46"height="17"v:shapes="_x0000_i1078"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image104.png">
③
<imgwidth="42"height="17"v:shapes="_x0000_i1079"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image106.png">
④
<imgwidth="42"height="20"v:shapes="_x0000_i1080"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image108.png">
【单选题】
<imgwidth="440"height="36"v:shapes="图片_x0020_179"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image185.png">
①
<imgwidth="449"height="27"v:shapes="图片_x0020_180"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image186.png">
②
<imgwidth="284"height="27"v:shapes="图片_x0020_181"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image187.png">
③
<imgwidth="278"height="23"v:shapes="图片_x0020_182"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image188.png">
【单选题】
设<imgwidth="18"height="18"v:shapes="_x0000_i1095"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">是一个<imgwidth="14"height="16"v:shapes="_x0000_i1096"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image002.png">阶<imgwidth="40"height="20"v:shapes="_x0000_i1097"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image082.png">阶方阵,下列陈述中正确的是()
①
如存在数<imgwidth="16"height="20"v:shapes="_x0000_i1098"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">和向量<imgwidth="18"height="16"v:shapes="_x0000_i1099"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image084.png">使<imgwidth="72"height="20"v:shapes="_x0000_i1100"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image086.png">,则<imgwidth="18"height="16"v:shapes="_x0000_i1101"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image084.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1102"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的属于特征值<imgwidth="16"height="20"v:shapes="_x0000_i1103"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">的特征向量
②
如存在数<imgwidth="16"height="20"v:shapes="_x0000_i1104"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">和非零向量<imgwidth="18"height="16"v:shapes="_x0000_i1105"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image084.png">,使<imgwidth="114"height="28"v:shapes="_x0000_i1106"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image088.png">,则<imgwidth="16"height="20"v:shapes="_x0000_i1107"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1108"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的特征值
③
<imgwidth="18"height="18"v:shapes="_x0000_i1109"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的2个不同的特征值可以有同一个特征向量
④
<imgwidth="64"height="26"v:shapes="_x0000_i1110"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image090.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1111"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的3个互不相同的特征值,<imgwidth="70"height="26"v:shapes="_x0000_i1112"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image066.png">依次是<imgwidth="18"height="18"v:shapes="_x0000_i1113"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的属于<imgwidth="64"height="26"v:shapes="_x0000_i1114"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image090.png">的特征向量,则<imgwidth="70"height="26"v:shapes="_x0000_i1115"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image066.png">有可能线性相关
【单选题】
设二维随机变量<imgwidth="46"height="21"v:shapes="_x0000_i1049"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image042.png"><imgwidth="79"height="41"v:shapes="_x0000_i1050"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image044.png">,则<imgwidth="84"height="21"v:shapes="_x0000_i1051"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image046.png">()
①
<imgwidth="16"height="41"v:shapes="_x0000_i1052"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image048.png">
【单选题】
<imgwidth="367"height="47"v:shapes="图片_x0020_70"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image077.png">
③
<imgwidth="24"height="20"v:shapes="图片_x0020_71"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image078.png">
④
<imgwidth="13"height="20"v:shapes="图片_x0020_72"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image079.png">
【单选题】
矩阵()合同于<imgwidth="98"height="108"v:shapes="_x0000_i1278"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image304.png">
①
<imgwidth="94"height="84"v:shapes="_x0000_i1279"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image306.png">
②
<imgwidth="94"height="84"v:shapes="_x0000_i1280"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image308.png">
③
<imgwidth="110"height="84"v:shapes="_x0000_i1281"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image310.png">
④
<imgwidth="84"height="84"v:shapes="_x0000_i1282"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image312.png">
【单选题】
设总体<imgwidth="84"height="22"v:shapes="_x0000_i1356"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image412.png">,<imgwidth="20"height="20"v:shapes="_x0000_i1357"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image461.png">未知,<imgwidth="75"height="26"v:shapes="_x0000_i1358"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image476.png">是来自<imgwidth="12"height="14"v:shapes="_x0000_i1359"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image426.png">的样本,<imgwidth="12"height="20"v:shapes="_x0000_i1360"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image478.png">为样本均值,<imgwidth="12"height="14"v:shapes="_x0000_i1361"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image480.png">为样本标准差。是检验问题为<imgwidth="164"height="22"v:shapes="_x0000_i1362"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image482.png">则检验的统计量为()
①
<imgwidth="135"height="35"v:shapes="_x0000_i1363"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image484.png">
②
<imgwidth="135"height="35"v:shapes="_x0000_i1364"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image486.png">
③
<imgwidth="135"height="37"v:shapes="_x0000_i1365"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image488.png">
④
<imgwidth="115"height="37"v:shapes="_x0000_i1366"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image490.png">
【单选题】
设随机变量<imgwidth="19"height="17"v:shapes="_x0000_i1256"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image266.png">的均值<imgwidth="68"height="21"v:shapes="_x0000_i1257"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image360.png">,方差<imgwidth="75"height="25"v:shapes="_x0000_i1258"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image362.png">,则<imgwidth="60"height="25"v:shapes="_x0000_i1259"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image364.png">()
①
<imgwidth="54"height="25"v:shapes="_x0000_i1260"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image366.png">
②
<imgwidth="54"height="25"v:shapes="_x0000_i1261"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image368.png">
③
<imgwidth="41"height="18"v:shapes="_x0000_i1262"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image370.png">
④
<imgwidth="41"height="18"v:shapes="_x0000_i1263"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image372.png">
【单选题】
设<imgwidth="226"height="84"v:shapes="_x0000_i1188"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image228.png">,则线三条直线<imgwidth="142"height="84"v:shapes="_x0000_i1189"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image230.png"><imgwidth="28"height="26"v:shapes="_x0000_i1190"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image232.png"><imgwidth="184"height="30"v:shapes="_x0000_i1191"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image234.png">交于一点的充要条件是()
①
<imgwidth="70"height="26"v:shapes="_x0000_i1192"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image226.png">线性相关
②
<imgwidth="70"height="26"v:shapes="_x0000_i1193"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image226.png">线性无关
③
秩<imgwidth="98"height="28"v:shapes="_x0000_i1194"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image236.png">秩<imgwidth="62"height="28"v:shapes="_x0000_i1195"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image238.png">
④
<imgwidth="70"height="26"v:shapes="_x0000_i1196"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image226.png">线性相关,<imgwidth="46"height="26"v:shapes="_x0000_i1197"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image240.png">线性无关