统计问题7个人解答.doc

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1、对问题中的表格进行matlab操作如下：A=[42.4,10.2,116.8,4.8,43.6,13.3,61.1,99.3,139.3,55.5,68.3,83.4,90,18.8,47.6,99.6,100.1,80.6,90,100.8,146.1,55.1;12,19.4,24.6,28.8,24.7,28.3,18.7,18.3,9.4,8.1,3.5,5.7,12.8,19.4,22.8,21,23,2.8,21.2,15.1,8.4,6.7;24,18.4,12.5,1,2.8,1.8,8.8,13.

2、7,18.7,22.6,26.7,27.5,23.7,17.4,13.3,9.5,3.6,2.6,6.8,14.2,19.6,22.4;22.7,15.1,12.1,4.4,5.4,4.7,8.5,11.8,17.9,22.3,29.1,29.4,23.6,15.1,12.3,10.6,6.7,6.2,8.3,13.7,18.6,21.2];协方差>>cov(A)ans=1.0e+003*Columns1through70.1592-0.04840.5422-0.10420.1338-0.05410.2550-0.

3、04840.0172-0.17910.0258-0.04990.0100-0.08520.5422-0.17912.5537-0.09450.87520.11091.2599-0.10420.0258-0.09450.16420.06710.1441-0.02290.1338-0.04990.87520.06710.36170.12980.4465-0.05410.01000.11090.14410.12980.14160.07670.2550-0.08521.2599-0.02290.44650.07670.62

4、520.4699-0.15312.1413-0.10860.71560.06601.05220.7303-0.23523.0873-0.25660.97030.00281.50190.2522-0.07860.9104-0.14580.2428-0.06390.43240.3381-0.10591.1513-0.22020.2853-0.11400.54110.4139-0.13071.5073-0.23410.4068-0.09910.71670.4268-0.13641.7265-0.17840.5211-0.

5、03070.83460.00110.00030.04640.01450.02570.01710.02560.1546-0.05200.81720.00550.30210.06860.40860.4625-0.15382.1859-0.07760.75140.09801.07880.4623-0.15662.2825-0.04160.80910.13871.13220.4413-0.14551.9214-0.13390.62030.02540.93810.4099-0.13761.9925-0.04850.69870

6、.10980.98660.4908-0.15972.1735-0.13630.71050.04291.06400.7725-0.24843.2480-0.27811.0158-0.00461.57890.2572-0.07950.9210-0.15150.2431-0.06830.4369Columns8through140.46990.73030.25220.33810.41390.42680.0011-0.1531-0.2352-0.0786-0.1059-0.1307-0.13640.00032.14133.

7、08730.91041.15131.50731.72650.0464-0.1086-0.2566-0.1458-0.2202-0.2341-0.17840.01450.71560.97030.24280.28530.40680.52110.02570.06600.0028-0.0639-0.1140-0.0991-0.03070.01711.05221.50190.43240.54110.71670.83460.02561.80102.61430.78350.99681.29551.46820.03642.6143

8、3.85961.20091.55211.98282.18990.04060.78351.20090.40360.53670.66390.69640.00430.99681.55210.53670.72210.88290.90770.00021.29551.98280.66390.88291.09321.14860.00681.46822.18990.6964