Question: 1. Using sample descriptive statistics, give estimates for the model parameters $mu_i, sigma_{i}^{2}, sigma_i, sigma_{i,j}, ho_{i,j}$. Put the estimated mean values in the vector `muhat.vals`

1. Using sample descriptive statistics, give estimates for the model parameters $\mu_i, \sigma_{i}^{2}, \sigma_i, \sigma_{i,j}, ho_{i,j}$. Put the estimated mean values in the vector `muhat.vals` and put the estimated covariance matrix in the matrix object `sigma.mat.` These will be inputs for the portfolio theory examples

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