1[2 {"id":"C1","text":"The estimated programme effect is 0.96 points (treated minus control student-weighted mean score).","results_keys":["tau_hat"],"status":"supported","caveat":"Point estimate only; imprecise."},3 {"id":"C2","text":"At the 5% level, with school-clustered (CR1, t with 39 df) inference, the data do not support a non-zero programme effect (p = 0.195; 95% CI [-0.51, 2.44]).","results_keys":["effect_significant_5pct","p_value","tau_ci_low","tau_ci_high","se_cluster"],"status":"supported","caveat":"Failure to reject is not evidence of no effect; moderate positive effects remain compatible with the data."},4 {"id":"C3","text":"The naive iid standard error (0.28) understates uncertainty by a factor of about 2.6 compared with the cluster-robust SE (0.73), and would wrongly suggest a highly significant effect.","results_keys":["se_iid","se_cluster"],"status":"supported","caveat":"With 40 clusters the cluster SE may itself be slightly too small."},5 {"id":"C4","text":"About 24% of residual score variance is between schools (ICC = 0.24).","results_keys":["icc_hat"],"status":"supported","caveat":"ANOVA estimator from 40 schools; imprecise."}6]7