Questiоn 4 Inference оn Cоefficients аnd Bаseline (6 points) Use trаinData for this question a) (3 points) Calculate the 95% confidence intervals for all the coefficients of model2. Based on these intervals, which predictors are statistically significant at the 0.05 significance level? b) (3 points) In the pre-processing of the data, Employment_Status was converted with as.factor(). Explain, using both code and a description, how you can tell what the baseline category is and how you can change the baseline to "Unemployed". Refit the full model with the new baseline. What changes in the model output and what stays the same?