Which marketing strategy has been statistically proven most effective for increasing adoption rates of new mathematics learning software in K-12 schools?

Educational mathematics products represent a multi-billion dollar industry worldwide, from textbooks to software to manipulatives. The marketing of these products requires special strategies to appeal to both educators and students. This poll tests your knowledge of how mathematical products are positioned and sold in the educational marketplace. Do you understand the psychology behind successful math product marketing?

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Free trials with advanced analytics reporting that demonstrate student improvement metrics to administrators
Celebrity mathematician endorsements and sponsorships that appeal to students' aspirational goals
Visually striking package design and branding that stands out in educational catalogs and conventions
Significant early-adoption discounts that incentivize schools to purchase before competitors