Which marketing metric is specifically developed for mathematical educational software to measure conceptual understanding rather than just usage time?

In the world of mathematics education and products, marketing strategies often rely on specific metrics and approaches tailored to the unique needs of the industry. From textbook publishers to educational software companies, mathematical product marketing requires understanding both the subject matter and effective promotional techniques. Test your knowledge about how mathematical products are marketed and measured in this challenging trivia question!

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Comprehension Quotient (CQ) - measuring the correlation between time spent on problems and accuracy of solutions
Mathematical Engagement Index (MEI) - tracking only the number of problems attempted regardless of completion
Solution Velocity Rate (SVR) - measuring only the speed at which users complete mathematical problems
Algorithmic Attention Score (AAS) - tracking eye movement across mathematical formulas without measuring comprehension