【单选题】
设总体<imgwidth="86"height="22"v:shapes="_x0000_i1257"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image373.png">,其中<imgwidth="35"height="22"v:shapes="_x0000_i1258"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image375.png">已知,<imgwidth="86"height="22"v:shapes="_x0000_i1259"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png"><imgwidth="46"height="18"v:shapes="_x0000_i1260"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image379.png">为来自总体<imgwidth="14"height="12"v:shapes="_x0000_i1261"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image341.png">的样本,<imgwidth="14"height="18"v:shapes="_x0000_i1262"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image382.png">为样本均值,<imgwidth="12"height="20"v:shapes="_x0000_i1263"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image384.png">为样本方差,则下列统计量中服从<imgwidth="9"height="18"v:shapes="_x0000_i1264"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image386.png">分布的是()
①
<imgwidth="75"height="69"v:shapes="_x0000_i1265"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image388.png">
②
<imgwidth="75"height="69"v:shapes="_x0000_i1266"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image390.png">
③
<imgwidth="75"height="73"v:shapes="_x0000_i1267"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image392.png">
④
<imgwidth="53"height="86"v:shapes="_x0000_i1268"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image394.png">
【单选题】
设随机变量<imgwidth="110"height="25"v:shapes="_x0000_i1125"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image167.png">为独立同分布序列,且<imgwidth="92"height="25"v:shapes="_x0000_i1126"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image169.png">服从参数为<imgwidth="15"height="19"v:shapes="_x0000_i1127"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image171.png">的指数分布,则下面式子中正确的是()
①
<imgwidth="173"height="90"v:shapes="_x0000_i1128"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image173.png">
②
<imgwidth="191"height="90"v:shapes="_x0000_i1129"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image175.png">
③
<imgwidth="192"height="90"v:shapes="_x0000_i1130"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image177.png">
④
<imgwidth="192"height="90"v:shapes="_x0000_i1131"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image179.png">
【单选题】
<imgwidth="557"height="118"v:shapes="图片_x0020_13"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image013.png">
①
<imgwidth="31"height="23"v:shapes="图片_x0020_14"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image014.png">
②
<imgwidth="67"height="34"v:shapes="图片_x0020_15"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image015.png">
③
<imgwidth="18"height="25"v:shapes="图片_x0020_16"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image016.png">
④
<imgwidth="33"height="26"v:shapes="图片_x0020_17"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image017.png">
【单选题】
设总体<imgwidth="63"height="20"v:shapes="_x0000_i1122"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image170.png">,则<imgwidth="12"height="14"v:shapes="_x0000_i1123"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image172.png">的矩估计和极大似然估计分别为()
①
矩估计<imgwidth="40"height="22"v:shapes="_x0000_i1124"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image174.png">极大似然估计<imgwidth="35"height="22"v:shapes="_x0000_i1125"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image176.png">
②
矩估计<imgwidth="46"height="37"v:shapes="_x0000_i1126"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image178.png">极大似然估计<imgwidth="35"height="22"v:shapes="_x0000_i1127"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image176.png">
③
矩估计<imgwidth="46"height="37"v:shapes="_x0000_i1128"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image178.png">极大似然估计<imgwidth="37"height="37"v:shapes="_x0000_i1129"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image180.png">
④
矩估计<imgwidth="40"height="22"v:shapes="_x0000_i1130"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image174.png">极大似然估计<imgwidth="37"height="37"v:shapes="_x0000_i1131"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image180.png">
【单选题】
设随机事件A与B相互独立,<imgwidth="118"height="21"v:shapes="_x0000_i1058"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image068.png">,则<imgwidth="77"height="21"v:shapes="_x0000_i1059"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image070.png">()
【单选题】
设<imgwidth="32"height="21"v:shapes="_x0000_i1056"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image046.png">为两个随机事件,且<imgwidth="73"height="21"v:shapes="_x0000_i1057"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image048.png">,则<imgwidth="80"height="21"v:shapes="_x0000_i1058"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image050.png">()
①
<imgwidth="37"height="21"v:shapes="_x0000_i1059"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image052.png">
②
<imgwidth="48"height="21"v:shapes="_x0000_i1060"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image054.png">
③
<imgwidth="66"height="21"v:shapes="_x0000_i1061"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image056.png">
【单选题】
随机变量X服从正态分布<imgwidth="64"height="25"v:shapes="_x0000_i1160"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image113.png">,则随着<imgwidth="16"height="15"v:shapes="_x0000_i1161"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image222.png">的增大,概率<imgwidth="103"height="27"v:shapes="_x0000_i1162"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image224.png">()
【单选题】
<imgwidth="356"height="29"v:shapes="图片_x0020_89"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image096.png">
①
<imgwidth="37"height="32"v:shapes="图片_x0020_90"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image097.png">
②
<imgwidth="33"height="32"v:shapes="图片_x0020_91"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image098.png">
③
<imgwidth="36"height="30"v:shapes="图片_x0020_92"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image099.png">
④
<imgwidth="28"height="29"v:shapes="图片_x0020_93"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image100.png">
【单选题】
若二次型<imgwidth="394"height="28"v:shapes="_x0000_i1252"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image259.png">为正定二次型,则<imgwidth="16"height="20"v:shapes="_x0000_i1253"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image261.png">的取值范围为()
①
<imgwidth="80"height="48"v:shapes="_x0000_i1254"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image263.png">
②
<imgwidth="66"height="48"v:shapes="_x0000_i1255"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image265.png">
③
<imgwidth="54"height="48"v:shapes="_x0000_i1256"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image267.png">
④
<imgwidth="94"height="48"v:shapes="_x0000_i1257"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image269.png">
【单选题】
设<imgwidth="14"height="22"v:shapes="_x0000_i1181"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image253.png">是<imgwidth="12"height="14"v:shapes="_x0000_i1182"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image255.png">次重复试验中事件<imgwidth="12"height="20"v:shapes="_x0000_i1183"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image257.png">出现的次数,<imgwidth="12"height="18"v:shapes="_x0000_i1184"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image259.png">是事件<imgwidth="12"height="20"v:shapes="_x0000_i1185"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image257.png">在每次试验中出现的概率,则对任意<imgwidth="35"height="22"v:shapes="_x0000_i1186"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image261.png">均有<imgwidth="127"height="42"v:shapes="_x0000_i1187"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image263.png">()