Which customer feedback metric is considered most predictive of long-term retention for mathematics education software products?

In the competitive world of mathematics education software, product success often hinges on understanding user engagement patterns. Companies developing math learning tools collect various metrics to improve their products, but one particular feedback metric has proven to be significantly more predictive of long-term user retention than others. Test your knowledge about product analytics in mathematics education software!

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Time spent on challenging problems before seeking hints
Overall satisfaction rating after completing a math module
Frequency of correct answers on first attempts
Number of practice examples completed per session