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Question 2. Practice With Omitted Variable Bias For each of these causal statements, identify one potential source of omitted variables bias and determine the direction of the bias. Example: Studies show that going vegan increases your lifespan by 2 years. Answer: Omitted variable is income. A vegan lifestyle is more expensive and those who can afford it are typically better off and have better health outcomes for a variety of other reasons. Income is positively correlated with health, so the bias overstates the relationship between veganism and lifespan. 1) Getting a degree in economics increases you future income by $5,000 per year. 2) Birth rates are lower in US cities than in US rural areas. 3) Those that have children in their teens are more likely to be in poverty. 4) Students do worse in classes that are taught online