What does percent correct measure?

Percent correct is a measure that evaluates how many of the total responses given were correct, expressed as a percentage. This metric is key in determining the effectiveness of a specific intervention or the mastery of a skill.

When considering the context of behaviors and responses, option B accurately defines this by indicating that it represents the number of correct responses divided by the total number of responses. This calculation helps practitioners understand how often a correct behavior occurs relative to all responses made, which is crucial for measuring progress and making informed decisions about interventions.

In contrast, while other options reference correct responses or opportunities, they don't encapsulate the overall measure of accuracy across all attempts made. This distinction is significant, as percent correct specifically emphasizes the relationship between correct responses and the entirety of responses instead of opportunities or trials alone.