consider the relationship between x1= annual household income (in dollars) and y= participation in sports (in hours per typical week)

-first think of a variable x2 that might mediate the relationship between x1 and y. whats your reasoning?

-Second , think of a variable x3 such that x1 mediates the relationship between x3 and y. Whats your reasoning? (In this case we refer to x3 as being 'antecedent' to the causal relationship between x1 and y)