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Question 2 5 pts As you know, correlation does not imply causation. After considering the results from the probit regression above, what argument(s) from below would you use to try to convince your professor that his regression results do not necessarily imply that attending lecture has a causal positive effect on final exam performance? (Check all that apply) Not even the sign of 3, in the probit regression has an easy interpretation. O The logit or linear probability model should be used. O B, may be subject to omitted variable bias O B, may be capturing the effect of work ethic in addition to the effect of class attendance (students with better work ethic get better grades and are less likely to skip class)