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2、B).4.?X?N(0,1),?)10(?,?u?P Xu?.?P Xx?,?x?().(A)/2u?.(B)1/2u?.(C)(1)/2u?.(D)?1u.?(C).5.?X?f(x),?31YX?g(y)?().(A)111()333fy?.(B)3(31)fy?.?2?6?(C)3()1f y?.(D)1133()f y?.?,?(A).6.?,?().(A)?X?n,p?().E Xnp?(B)?X?(-1,1)?()0D X?.(C)?X?,?()()D XE X?.(D)?2(,),XN?(0,1)XN?.?)1,1(?UX,?3112212)()(22?abXD.?(B).7
3、)?X?Y?(A)E(XY)=E(X)E(Y).(B)D(X+Y)=D(X)+D(Y).(C)Cov(X,Y)=0.(D)X?Y?.?X?Y?X?Y?,?.?(D).8.?X1,X2,Xn?2(,)XN?,?().(A)().E Xn?(B)2().D X?(C)22().E S?(D)?.?(C).9.?X?Y?,?().(A)X+Y?.(B)X2+Y2?2?.(C)X2?Y2?2?.(D)22XY?F?.?X?Y?,?X?Y?,?(A),(B),(D)?,?(C).10.?X?2?,?12,nXXX?X?,?2?().(A)X?S2.(B)X?211()niiXn?.(C)?2.(
4、D)X?211()niiXXn?.?(D).?3?6?18?.?.?1 2 3 4 5 6?ABCABCABC?4813 3516 11()33Fy?136 512 1.?A,B,C?.?A,B,C?1).2.?1,2,3,4?,?X,?1,2,X?,?Y.?PY=2=(?2).?PY=2=PX=1PY=2|X=1+PX=2PY=2|X=2+PX=3PY=2|X=3+PX=4PY=2|X=4 =41(0+21+31+41)=4813.3.?X?-1,0,1,2?,?cccc167,85,43,21.?c=(?3).?0|1?XXP=(?4).?13571,24816cccc?3516c?.?P
5、X1|X 0?=25816785212101?ccccXPXP.4.?X?F(x),?31YX?G y?(?5).?,?(A).5.?1X,2X,3X?2(,)XN?,?Y1231134XXkX?,?k=(?6).?1231111()3434EXXkXk?,?,k=512.?(10?)?,?4?,1?;?3?,3?;?3?,5?.?,?.(1)?(2)?,?.?A?iH?i?”,i=1,2,3.?P(iH)=13,i=1,2,3,123115(|),(|),(|)528P A HP A HP A H?.4?(1)?P(A)=112233()(|)()(|)()(|)P H P A HP HP
6、A HP HP A H?12053.4?4?6?(2)?P(2|HA)=222()()(|)20()()53P AHP HP A HP AP A?.2?(12?)?(X,Y)?(,)1,01,02,0,.f x yxyx?(1)(X,Y)?(),()XYfxfy?(2)1122P YX?(3)X?Y?.?(1)?01x?,20()(,)dd2xXfxf x yyyx?;?x?0?x?1?,()0Xfx?.?2,01,()0,?.Xxxfx?.2?0yz0.025=1.96.2?n=16,x=40,?=1,?0|4041|116xzn?=41.96.?,?=41.2?(2)?x?40,?=1,?=0.05,?0.02521.96,zz?2211()(401.96,401.96)1616,xzxznn?(39.51,40.49).?.3?39.5140.49?95%.2?:t0.025(24)=2.0639,t0.025(23)=2.0687,t0.05(24)=1.7109,t0.05(23)=1.7139 z0.025=1.96,z0.05=1.65
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