问题 设 $\binom{x_i}{y_i}, i=1,2, \cdots, n$ 是来自正态分布族 \begin{align*} \Bigg{N\Bigg(&\binom{\theta_1}{\theta_2}, \begin{pmatrix} \sigma_1^2 & \rho \sigma_1 \sigma_2 \ \rho \sigma_1 \sigma_2 & \sigma_2^2 \end{pmatrix}\Bigg), \ &-\infty<\theta_1, \theta_2<\infty, \sigma_1, \sigma_2>0,|\rho| \leqslant 1\Bigg} \end{align*} 的一个二维样本, 寻求 $\left(\theta_1, \sigma_1, \theta_2, \sigma_2,

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