May is a time for graduations. Suppose that you are interested in how much graduates from colleges in the area will be Making 10 years from now: You also suspect that their earnings may be related to their choice of major when they were undergraduates. Design an experiment or study that addresses the question of interest. Describe how you would administer it. Would your design in part A be able to determine a causal relationship between choice of major and earnings 10 years from graduation? Explain why or why not.