80 kirana, bakery, apparel and handicraft sellers, three coded seller apps, a per-order cost model and chi-square tests on who joins and who stays.
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- Structured seller questionnaire (Kannada/English, n ≈ 80)
- Seller-app comparison sheet (three coded seller apps)
- MS Excel: per-order cost-benefit model, pivot tables, charts
- IBM SPSS Statistics or Excel: chi-square, Mann-Whitney U
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