Do all calculations in Excel using full precision for intermediate steps (no rounding). Report final answers to two decimal places. If a number appears in scientific notation, keep that format." Build a multiple regression model with Risk as the dependent variable. The variable, Smoker, is a categorical variable. Transform it appropriately (Non-smoker = 0, Smoker=1) before building the regression mode. Set the parameters as follows. C.I. = 98% Include Residual Plots Answer the following questions and report your answers in an organized manner on the same data file. Shaded areas are provided for your answer. Part a: Write the estimated Regression Equation. Part b: How good the regression model fits the sample data? 1. What percent of variability of the Risk of developing Emphysema can be explained by the regression model