Reading and Interpreting Bar and Line Graphs

Staring at a raw table of data is much like staring at a sheet of complex musical notation. You might recognize the individual numbers just as you recognize individual notes on a staff, but grasping the overarching melody—the sudden spikes, the steady declines, the comparative magnitudes—requires a strenuous mental translation. Visual displays of quantitative data act as the instruments that play the music of mathematics. They take dense, abstract tables and map them onto physical, spatial dimensions, transforming a tedious chore of arithmetic into an immediate, intuitive realization of truth.

Just as musical notes are arranged spatially on a staff to visually represent melody and pitch, mathematical data points are plotted on a graph to reveal trends and numerical relationships at a glance.
Just as musical notes are arranged spatially on a staff to visually represent melody and pitch, mathematical data points are plotted on a graph to reveal trends and numerical relationships at a glance.

When you sit down to tackle the data interpretation questions on the Praxis Core Mathematics exam, you are essentially acting as a translator. Your job is to look at spatial relationships—the length of a rectangle, the tilt of a line segment—and accurately translate them back into numerical facts.