A/B-Test Writeup Checkpoint

# Submission: A/B-Test Writeup Checkpoint ## Brief Defend one experiment readout on `homepage_ab_test.csv`: power/sample-size pre-commit, SRM check, no-peeking statement, decision-first memo with effect size + CI, guardrails, and threat analysis. ## Dataset `homepage_ab_test.csv` + AB_Testing playbook. Holdout: a second experiment window used to check your method transfers (not your numbers). ## Starter guardrails (88) - Use the readout template (Decision / Effect / Guardrails / Threats). - Pre-commit block (metric, MDE, power, alpha, runtime) must precede results. ## Deterministic checks SRM chi-square recomputes; CI arithmetic correct; template sections all present. ## 100-pt rubric - Pre-commit completeness: 20 - SRM + peeking discipline: 20 - Effect size + CI correctness: 20 - Guardrails + threats (novelty/Simpson): 20 - Exec clarity (decision in first paragraph): 20