0.18 Create an Excel spreadsheet to produce a chart similar to Figure 9.5 showing samples from a bivariate Student's f - distribution with four degrees of freedom where the correlation is 0.5. Next suppose that the marginal distributions of |, and | '3 are Student's [ with four degrees of freedom but that a Gaussian copula with a copula correlation parameter of 0.5 is used to define the correlation between the two variables. Construct a chart showing samples from the joint distribution. Compare the two charts you have produced. 10 ~10 Figure 9.5 5,000 Random Samples from a Bivariate Student's f - distribution with Four Degrees of Freedom