EXAMPLE 6 Unemployment by education level

How has unemployment changed over time? Figure 10.7 is a line graph of the monthly national unemployment rate, by education level, for the United States from October 2008 through October 2014. For example, the unemployment rate for October 2009 was 15.2% for those with less than a high school diploma, 11% for those with a high school diploma, 8.7% for those with some college, and 4.7% for those with a bachelor’s degree or higher.