The linear regression model for the birth rate and poverty rate data is described below:

Y = 4.267 + 1.373X

Where, the variable Y is the birth rate per 1000 females andthe variable X= poverty rate, which is the percentage of population living in households with incomes below the federally defined poverty level.

1. What is the explanatory variable?
2. What is the response variable?
3. What does the slope mean in this context?
4. What does the y-intercept mean in this context?