(d) Draw three variants of the scatterplot matrix from (a): (1) use different colors/symbols for different age categories (2) use different colors/symbols for the two gender (3) use different colors/symbols for

each combination of age categories and gender. Include boxplots of each variable in the diagonal of the matrix. Add appropriate legends to show which point belongs to which age/gender. Comment about the marginal and bivariate distributions and how they differ by age and/or gender.