Fast food is often considered unhealthy because much of it is high in both fat and sodium.

Question:

Fast food is often considered unhealthy because much of it is high in both fat and sodium. But are the two related? Here are the fat and sodium contents of several brands of burgers.

a) Analyze the association between fat content and sodium using correlation and scatterplots.
b) Find Spearman's rho for these data. Compare it with the Pearson correlation. Comment.