-------------------------------------------------------------------------------- 4. STATISTICAL SIGNIFICANCE (Chi-square test) -------------------------------------------------------------------------------- - Arm D vs. Arm A: p < 0.001 (significant) - Arm D vs. Arm B: p = 0.002 (significant) - Arm D vs. Arm C: p < 0.001 (significant) - Arm B vs. Arm A: p = 0.021 (significant) - Arm B vs. Arm C: p = 0.004 (significant) - Arm A vs. Arm C: p = 0.612 (not significant)

-------------------------------------------------------------------------------- 7. LIMITATIONS -------------------------------------------------------------------------------- - Closed population may not generalize to open populations. - Incentive ($10) might increase response rates beyond typical real-world levels. - No testing of push notifications vs. in-app banners. - Trial length (7 days) may underestimate late responders.

Multi-channel arm reached 50% response by Day 2; single-channel arms required 4-5 days to approach 50%.

-------------------------------------------------------------------------------- END OF REPORT ================================================================================