Which label identifies the metric used for measuring behavior responses on a vertical axis?

The correct label for identifying the metric used for measuring behavior responses on a vertical axis is the Vertical axis label. In graphical representations of data, the vertical axis typically reflects the quantity of behavior that has been measured, such as the frequency of responses, duration, or intensity. This label is essential for accurately interpreting the data displayed, as it clearly indicates what is being measured and provides context for the information shown on the graph.

For example, if the vertical axis label indicates "Number of Responses," it allows observers to understand precisely how many times the behavior occurred during the observation period. Proper labeling on graphs is crucial because it contributes to the clarity of data presentation and facilitates effective communication of the results to stakeholders.

In contrast, other choices like the Behavioral outcome label or Response measure label, while relevant in discussing data, do not specifically refer to the label found on the vertical axis of a graph. Similarly, the Data value title refers to specific data points rather than the overall metric being measured along the vertical axis. Thus, the Vertical axis label uniquely serves the purpose of specifying the nature of the data quantified on that axis.