Which marketing metric is specifically used by mathematics textbook publishers to measure the correlation between student performance and their product usage?

In the world of mathematics education and resource retail, understanding marketing effectiveness is crucial for reaching educators and students. Mathematical product companies use specific metrics to evaluate their marketing campaigns and determine which strategies best connect with their target audience. Test your knowledge about how mathematics retailers track campaign success!

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Academic Performance Index (API)
Customer Acquisition Cost (CAC)
Click-Through Conversion Rate (CTCR)
Net Promoter Score (NPS)