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1、第二章习题部分解答-第90页1.解:由矩估计法:81aX74.002xi8i1821Sx26106(74.002)2i8i12n2866SS6106.85710n181第二章习题部分解答-第90页2(1)解:由矩估计法:A11'2(x)EXxdx12033A11(2)'11EXx(1)xdx102211(3)x11e2xdx11212x1n11
2、e2xdx2AX22222i1212ni1222AS()2222S1S2N1NN(1)1(4)Ax1i1NN2N21(5)11Axxdx1012()122k2(6)Akk(1)(1)1k223.解:设A{0},X表示A出现的次数,2()xa01PA()P{0}e2dx2aa0P{}(a)p0.7,11pa0.7,0.5254.解
3、:n(1)(1)()Lcxii1nln()L[lnlnc(1)ln]xii1nnln()L1[lncln]xiinlnclnx0ii11nnnlnxinlnci1n1(2)()Lxii1nln()Lx[ln(1)ln]ii1nln()L111[ln]0xii1222nn2(ln)xii1n11(3)()Lni1ln()Lnlnln()Ln011,,,
4、,nn1nn()L()0,other0,other11,()LL()nn()n()n()nn(4)()LCxixi(1)NxiNi1nxiln()L[lnCNxiln(Nxi)ln(1)]i1nnxii()Nxln()Lii1101xNn1212()xi(5)()Le2i12n2()xiln()L[ln2]2i12n22ln()Ln22(xx)2()ii[04
5、2i122n12i42ni1ncc(1)(6)()Lcxii1nln()L[lnccln(c1)ln]xii1ln()Lnc0不能解出,所以由ncc(1)L()cxin,1,,i1LL()()(1)(1)n2xi2(7)()Lx(i1)(1)i1nln()L[2ln(xii2)ln(1)ln(x1)]i1nxni2ln()Ln22i1]01n(8)()L()
6、xi(2)(xi1)(13)(xi2)n0(2)(13)nn12i1ln()L2045.解:~U(,0)n11(1)()L,,,0n1ni1()max,()LL()(1)~U(,2)n11(2)()Ln,1,,n2i1()n1nmin,()LL(),,,222nn6.解:1x(1)()Lfx(,)eiiii112x,,xxxxx1n(1)()i(1)i()nnin11
7、
8、xi
9、x()kx()l(n2)iL()ei1ek1li1nn22,n为奇n1()2时L()达到最大值nn()(1)22,n为偶27.解:1111~U(,),,,1n2222n1L()1,11i1()()22(1)()nor2所以不唯一。8.解nn(1)()Le()xti0,ln()L[ln(xt)ln]i0i1i1nln()L1nn(xti0)0ni1xt
10、0xint0i1nn(2)()Lte()xti0,ln()Lt[ln(xt)]00i0i1i1ln(