标准正态分布是( )。 A: u~N(0, 1) B: u~N(0, 0) C: u~N(1, 1) D: u~N(1, 0)
标准正态分布是( )。 A: u~N(0, 1) B: u~N(0, 0) C: u~N(1, 1) D: u~N(1, 0)
Sets: Aam/a,b,c/:m,n;EndsetsData: M,n=2 3 1 9 0 8;Enddata下列说法错误的是 A: m(1)=2,n(1)=9 B: m(1)=2,n(2)=9 C: m(2)=1,n(2)=9 D: m(3)=0,n(3)=8
Sets: Aam/a,b,c/:m,n;EndsetsData: M,n=2 3 1 9 0 8;Enddata下列说法错误的是 A: m(1)=2,n(1)=9 B: m(1)=2,n(2)=9 C: m(2)=1,n(2)=9 D: m(3)=0,n(3)=8
设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1).
设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1).
中国大学MOOC: 设X~N(2, 9)则Y= (X– 2 )/9 ~N(0, 1).
中国大学MOOC: 设X~N(2, 9)则Y= (X– 2 )/9 ~N(0, 1).
设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1). A: 正确 B: 错误
设X ~ N(2, 9)则Y = (X – 2 )/9 ~ N(0, 1). A: 正确 B: 错误
设总体X~N($\mu,{\sigma}^2$),$\mu,{\sigma}^2$未知,$x_{1},x_{2},...,x_{n} $ 是来自该总体的样本,记$\overline x=\frac{1}{n}\sum\limits_{i = 1}^{n}{x_{i}}$,则对假设检验$ H_{0}:u=u_{0},H_{1}:u!=u_{0}$的拒绝域为()
设总体X~N($\mu,{\sigma}^2$),$\mu,{\sigma}^2$未知,$x_{1},x_{2},...,x_{n} $ 是来自该总体的样本,记$\overline x=\frac{1}{n}\sum\limits_{i = 1}^{n}{x_{i}}$,则对假设检验$ H_{0}:u=u_{0},H_{1}:u!=u_{0}$的拒绝域为()
【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
当$|z|<0.5$时左边序列$x[n]$为 A: $[(\frac{1}{2})^n-2^n]u[-n-1]$ B: $[(\frac{1}{2})^n+2^n]u[-n-1]$ C: $[2^n-(\frac{1}{2})^n]u[-n-1]$ D: $[2^n+(-\frac{1}{2})^n]u[-n-1]$
当$|z|<0.5$时左边序列$x[n]$为 A: $[(\frac{1}{2})^n-2^n]u[-n-1]$ B: $[(\frac{1}{2})^n+2^n]u[-n-1]$ C: $[2^n-(\frac{1}{2})^n]u[-n-1]$ D: $[2^n+(-\frac{1}{2})^n]u[-n-1]$
图所示机构的自由度是( )。[img=197x160]18034e492717e18.jpg[/img] A: n=8, PL=11, Ph=1, F=1 B: n=8, PL=10, Ph=2, F=2 C: n=9, PL=12, Ph=2, F=1 D: n=9, PL=13, Ph=0, F=1
图所示机构的自由度是( )。[img=197x160]18034e492717e18.jpg[/img] A: n=8, PL=11, Ph=1, F=1 B: n=8, PL=10, Ph=2, F=2 C: n=9, PL=12, Ph=2, F=1 D: n=9, PL=13, Ph=0, F=1
下列各组量子数合理的是( ) A: n=1, l=0, m=0, ms=-1/ 2 B: n=2, l=2, m=0, ms=1 C: n=2, l=0, m=1, ms=1/2 D: n=1, l=0, m=-1, ms=-1/2
下列各组量子数合理的是( ) A: n=1, l=0, m=0, ms=-1/ 2 B: n=2, l=2, m=0, ms=1 C: n=2, l=0, m=1, ms=1/2 D: n=1, l=0, m=-1, ms=-1/2