Figure 1.4: Variables and their descriptions for the loan50 data set. GUIDED PRACTICE 1.4 We consider data for 3,142 counties in the United States, which includes each county's name, the state where it resides, its population in 2017, how its population changed from 2010 to 2017 , poverty rate, and six additional characteristics. How might these data be organized in a data matrix? 6 The data described in Guided Practice 1.4 represents the county data set, which is shown as a data matrix in Figure 1.5. The variables are summarized in Figure 1.6