Question: In the context of plotting bivariate normal densities, you typically need to experiment with different values in the mean vector and the variance-covariance matrix. Why?

In the context of plotting bivariate normal densities, you typically need to experiment with different values in the mean vector and the variance-covariance matrix. Why? How do you know which values to choose? How do you know you've found the optimal values? What are the consequences on the interpretation of results if you did not choose the optimal values? Provide an example, and EXPLAIN please.

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