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Question 6. Private universities Fitted line Pct contributing alumni -2 -1 D 1 2 3 |n(Pct parttime undergrad) Figure 3. For private universities, percent of the undergraduate students who are part-time enrolled is negatively related to percent of alumni who make nancial contributions to the university after 10 years of graduation. Present a reasonable lurking variable that would explain this relationship. In particular, be sure to clarify how your lurking variable is associated with percent of part-time undergraduates, and how your lurking variable is associated with percent of alumni who make nancial contributions to their university