Which of the following is calculated by dividing correct responses by both correct and incorrect responses?

The calculation described involves determining the proportion of correct responses relative to the total number of opportunities, which comprise both correct and incorrect responses. This specific metric is known as percent correct. By dividing the number of correct responses by the sum of correct and incorrect responses, you obtain a clear percentage indicating how many responses were accurate compared to all responses given. This measure is commonly used in various educational and behavioral assessments to evaluate skill acquisition or performance effectiveness.

Other potential choices relate to different metrics or statistical measures. Percent duration typically refers to the amount of time a behavior occurs relative to a specified observation period, percent occurrence measures the frequency of a behavior occurring compared to the number of opportunities for it to occur, and percent reliability assesses the consistency of measurements across different observers or assessment periods. Each of these metrics serves a distinct purpose in assessment and evaluation, further highlighting the specific nature of percent correct in calculating accuracy of responses.