• 2022-06-29 问题

    设\(3 \times 4\)阶矩阵\(A\)的秩为1,\(\alpha ,\beta ,\gamma \)是齐次线性方程组\(Ax=0\)的三个线性无关的解向量,则方程组的基础解系为( ) A: \(\alpha ,\beta ,\alpha + \beta \) B: \(\alpha ,\alpha + \beta ,\alpha + \beta + \gamma \) C: \(\gamma ,\beta ,\gamma - \beta \) D: \(\alpha - \beta ,\gamma - \beta ,\gamma - \alpha \)

    设\(3 \times 4\)阶矩阵\(A\)的秩为1,\(\alpha ,\beta ,\gamma \)是齐次线性方程组\(Ax=0\)的三个线性无关的解向量,则方程组的基础解系为( ) A: \(\alpha ,\beta ,\alpha + \beta \) B: \(\alpha ,\alpha + \beta ,\alpha + \beta + \gamma \) C: \(\gamma ,\beta ,\gamma - \beta \) D: \(\alpha - \beta ,\gamma - \beta ,\gamma - \alpha \)

  • 2022-05-29 问题

    从一组有效保单中抽取100份,发现有3个索赔,假如该险种的索赔频率θ的先验分布为Beta(2,200),则θ的后验分布为()。 A: Beta(4,297) B: Beta(5,300) C: Beta(5,297) D: Beta(3,297) E: Beta(4,300)

    从一组有效保单中抽取100份,发现有3个索赔,假如该险种的索赔频率θ的先验分布为Beta(2,200),则θ的后验分布为()。 A: Beta(4,297) B: Beta(5,300) C: Beta(5,297) D: Beta(3,297) E: Beta(4,300)

  • 2022-05-29 问题

    (2). 样本容量 \( n \) 确定后,在一个假设检验中,给定显著水平为 \( \alpha<br/>\),设此第二类错误的概率为 \( \beta \),则必有( )。 A: \( \alpha +\beta =1 \) B: \( \alpha +\beta &gt;1 \) C: \( \alpha +\beta D: \( \alpha<br/>+\beta

    (2). 样本容量 \( n \) 确定后,在一个假设检验中,给定显著水平为 \( \alpha<br/>\),设此第二类错误的概率为 \( \beta \),则必有( )。 A: \( \alpha +\beta =1 \) B: \( \alpha +\beta &gt;1 \) C: \( \alpha +\beta D: \( \alpha<br/>+\beta

  • 2022-06-29 问题

    设\( A,P \)是可逆矩阵,\( \beta \)是\( A \)的属于特征值\( \lambda \)的特征向量,则矩阵\( {P^{ - 1}}AP \)的一个特征值和对应的特征向量是( ) A: \( {\lambda ^{ - 1}},P\beta \) B: \( {\lambda ^{ - 1}},{P^{ - 1}}\beta \) C: \( \lambda ,P\beta \) D: \( \lambda ,{P^{ - 1}}\beta \)

    设\( A,P \)是可逆矩阵,\( \beta \)是\( A \)的属于特征值\( \lambda \)的特征向量,则矩阵\( {P^{ - 1}}AP \)的一个特征值和对应的特征向量是( ) A: \( {\lambda ^{ - 1}},P\beta \) B: \( {\lambda ^{ - 1}},{P^{ - 1}}\beta \) C: \( \lambda ,P\beta \) D: \( \lambda ,{P^{ - 1}}\beta \)

  • 2022-06-19 问题

    Relative to the underlying stock, a call option always has A: a higher beta and a higher standard deviation of return. B: a lower beta and a higher standard deviation of return. C: a higher beta and a lower standard deviation of return. D: a lower beta and a lower standard deviation of return.

    Relative to the underlying stock, a call option always has A: a higher beta and a higher standard deviation of return. B: a lower beta and a higher standard deviation of return. C: a higher beta and a lower standard deviation of return. D: a lower beta and a lower standard deviation of return.

  • 2022-06-07 问题

    The news ______ to be a mistake. A: turn over B: turn on C: turn off D: turn out

    The news ______ to be a mistake. A: turn over B: turn on C: turn off D: turn out

  • 2022-05-27 问题

    Changes in the policy will, ____, affect your daily life. A: on turn B: by turn C: with turn D: in turn

    Changes in the policy will, ____, affect your daily life. A: on turn B: by turn C: with turn D: in turn

  • 2021-04-14 问题

    Beta measures _____ risk.

    Beta measures _____ risk.

  • 2021-04-14 问题

    【单选题】The party ___ to be very successful. A. turn out B. turn on C. turn up D. turn into

    【单选题】The party ___ to be very successful. A. turn out B. turn on C. turn up D. turn into

  • 2022-06-07 问题

    _______ the TV now, and go to sleep. A: Turn on B: Turn down C: Turn off D: Turn up

    _______ the TV now, and go to sleep. A: Turn on B: Turn down C: Turn off D: Turn up

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