Part II: Multiple Regression. In this part, you will use a regression to understand the racial disparities in birth weight. First complete Table 3, and comment on the observed racial gaps in birth weight . Table 3: Mean birth weiht b race. Standard Error Now we want to know: Are the observed differences in birth weight between White and other racial groups (Black and Others) statistically signicant? What are the impacts of other risk factors on birth weight, and how does the racial gap in birth weight change after controlling for other risk factors? To answer these questions, you are asked to conduct a series of regression analyses. Run three regressions in the following order: Model 1: Treat birth weight as the dependent variable and use two dummy variables as predictors: \"Black\" and \"Other\" race. Model 2: Further include \"Smoke\" Model 3: Further include \"Moth_age\