1、20142015?1?B?:0.025(39)2.0227t?,0.025(40)2.0211t?,0.05(39)1.6849t?,0.05(40)1.6839t?,z0.025=1.96,z0.05=1.65.?,?20?.?.?1 2 3 4 5?1.?A?B?AB?,?().(A)?A?,?B?.(B)A,B?.(C)?A?,?B?.(D)?A?B?.2.?A?B?P(AB)=0,?().(A)A?B?.(B)AB?.(C)AB?.(D)P(A)=0?P(B)=0.3.?X?f(x),?31YX?g(y)?().(A)111()333fy?.(B)3(31)fy?.(
2、C)3()1f y?.(D)1133()f y?.4.?,?().(A)?X?n,p?().E Xnp?(B)?X?(-1,1)?()0D X?.(C)?X?,?()()D XE X?.(D)?2(,),XN?(0,1)XN?.5.?X1,X2,Xn?2(,)XN?,?().(A)().E Xn?(B)2().D X?(C)22().E S?(D)?.?B?4?1?1?2?3?4?5?.?.?.?.?20?.?1 2 3 4 5?1.?A,B,C?.?A,B,C?(?1).2.?1,2,3,4,5,6?,?X,?1,2,X?,?Y.?PY=4=(?2).3.?X?0,1,2,3?,?1111,
3、24816cccc.?2|1P XX?=(?4).4.?(2,9)XN?,?X?X1,X2,?3X1-2X2?(?4).5.?1X,2X,3X?2(,)XN?,?Y1231134XXkX?,?k=(?5).?(10?)?15?12?58.?.?,?.(1)?(2)?,?.?(10?)?(X,Y)?(,)1,01,02,0,.f x yxyx?(1)(X,Y)?(),()XYfxfy?(2)1122P YX?(3)X?Y?.?B?4?2?.?.?.?.?(10?)?X?()Xfx?1142 ln20 xx?Y?2?X,?:(1)?X?(2)Y?.?(10?)?,?5?25?55?.?X?,?X?0,60?.?.?B?4?3?.?.?.?.?(10?)?X?1?,?X?1e,0,(,)0,0,1xxf xx?0?,X1,X2,Xn?X?,x1,x2,x n?X1,X 2,X n?.(1)?;(2)?;(3)?x=3?.?(10?)?,?40?,?105?x?,?28?s?.?.(1)?=0.05?,?100?(2)?0.95,?.?B?4?4?
浙ICP备2021020529号-1 | 浙B2-20240490 
