(D) (overline (x)-(u)_(a12)dfrac (2)(sqrt {n)},overline (x)+(u)_(a12)dfrac (2)(sqrt {n)})

A)(overline(X) - u_(alpha) (2)/(sqrt(n)), overline(X) + u_(alpha) (2)/(sqrt(n))

A)(overline(X)-u_((alpha)/(2))(4)/(sqrt(n)),overline(X)+u_((alpha)/(2))(4)/(sqrt

(B) dfrac (sqrt {n)(overline (X)-mu )}(S)sim t(n-1).-|||-(C) dfrac (sqrt {n)(ove

(overline (X))=dfrac ({sigma )^2}(n)-|||-C. (overline (X)-mu )=dfrac ({sigma )^2

(sigma )_(n)=sqrt (dfrac {pi (1-pi ))(n)}-|||-C. (sigma )_(overline {x)}=dfrac (

dfrac (1)(n-1)sum _(i=1)^n(({X)_(i)-overline (X))}^2 .-|||-n-|||-C. sqrt (dfrac

.-(x)^2(n) 的简单随机样本, overline (X)=dfrac (1)(n)sum _(i=1)^n(X)_(i) ,则-|||-|E(overl

(B) (n-1)(S)^2+(overline {X)}^2 (C) (S)^2+(overline {X)}^2. (D) dfrac (n-1)(n)(S

一维线性谐振子处在基态 psi (x)=sqrt (alpha /sqrt {pi )}(e)^-dfrac (1{2)(a)^2(x)^2} ,求-|||-(

(12) int dfrac (x)(sqrt {2)-3(x)^2}dx;