数理统计课后题标准答案

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1、《数理统计》习题答案第一章n19294103105106Xxi100ni1511n2252Sxiixx100nii1151.解：1222229210094100103100105100106100534l1*2.解：子样平均数Xmxiini11183406102626041l22*子样方差Smiixxni11222281440341064226460

2、18.672子样标准差SS4.32xai3.解：因为yic所以xacyn2ii21sxxixni1n1xxi2nni11acyacyinnii1acyn2i1ni1cyicynni11nacyi2n2nci1yyini1ncayi2ni11n2因为syyiy所以acyni1222所以xacy成立scxsy成立1MXX0en172RXX3.2147.

3、21n1MXX1.2en8124.解：变换yx2000iii123456789x193916973030242420202909181520202310iy-61-303103042420909-18520310in116130310304242090918520310yyi9ni1240.444n221syyiyni1122261240.444303240.4441030240.4449222424240

4、.44420240.444909240.444222185240.44420240.444310240.444197032.247利用3题的结果可知xy20002240.44422ss197032.247xy5.解：变换yx10080iii12345678910111213x79.9880.0480.0280.0480.0380.0380.0479.9780.0580.0380.0280.0080.02iy-2424334-353202in1311yyy

5、iinii111312424334353202132.00n221syyiyni121222222.00322.0052.00342.001322332.0032.005.3077利用3题的结果可知yx8080.021002s24ys5.307710x100006.解：变换yx1027ii*x23.526.128.230.4iy-35-91234im2341il1ymiiyn

6、i113529312434101.5yx27=26.85101l22smyiyiyni1122222351.5391.54121.5341.510440.25221ss4.4025xy1007解：身高154158158162162166166170170174174178178182组中值156160164168172176180学生数101426281282l1*xmxiini11156101601

7、41642617212168281768180210016621l22*smiixxni11222210156166141601662616416628168166100222121721668176166218016633.448解：将子样值重新排列（由小到大）-4，-2.1，-2.1，-0.1，-0.1，0，0，1.2，1.2，2.01，2.22，3.2，3.21MXX0en17

8、2RXX3.2147.21n1MXX1.2en812nn1211nx12ijnxnn12ij11nxnx11229解：xnnnn1212nn21122sxixnn12i1nn12122xxinn12i1nn