2. In Fragile Families and Child Wellbeing study, a researcher wants to evaluate whether primary caregiver relationship to youth and how much time youth lives with primary caregiver coupled with household income would affect number of days youth absent from school. The following variables are considered: time: how much time youth lives with the primary caregiver. (1=less than half of the time, 0=most of the time) income: primary caregiver household income (in the unit of thousand dollar) days: number of days youth absent from school. relationship: primary caregiver relationship to the youth relationship RI - dummy 1 R2 - dummy 2 Biological father 0 0 Biological mother 0 other 0 The researcher wants to fit a multiple regression model. Assume 5% level of significance. a. What are the explanatory variables (based on the mentioned research question), and what is the response variable? (4 points)