In ABA data, what do level, trend, and variability refer to on a line graph?

• A. Line graph's color codes
• B. The configuration of axes
• C. The central tendency only
• D. The displayed data's magnitude, direction, and fluctuations

Answer: (D)

The main idea here is understanding what a line graph in ABA shows about behavior over time. Level reflects the magnitude of the data within a phase—the typical value or central tendency, so you can tell roughly where the data sit on the vertical axis. Trend is the overall direction across time—whether the data are going up, down, or staying about the same across sessions. Variability describes how much the data points fluctuate around that level over time—the degree of spread or consistency from point to point. Put together, level, trend, and variability give you the displayed data’s magnitude, direction, and fluctuations, which help you judge how the behavior is changing and how stable it is.

Why other phrasing doesn’t fit: color codes of a line or graph styling don’t tell you about the data pattern itself. The configuration of axes describes the graph’s layout, not the actual behavior data. Focusing only on central tendency misses the trend and variability, which are essential for interpreting changes over time.