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CM6.1-6 | Biostatistics for Community Medicine — Assignment

Grading Rubric — Biostatistics Data Interpretation Rubric

Criterion	Points	Full-marks descriptor
Data Classification and Presentation (CM6.2): Accurate classification of variable types and appropriate graph selection	5 pts	Exceeds: All variables correctly classified with clear justification; graph choices are accurate with precise reasoning about suitability for variable type; insightful comment on collapsing categories showing understanding of ordinal→binary information loss
Descriptive Statistics and Summary Measures (CM6.4, CM6.6): Correct selection and interpretation of central tendency, dispersion, and CIs	5 pts	Exceeds: Accurately reads skew from mean vs median relationship; correctly justifies Mean±SD vs Median+IQR for each group; CI calculated correctly and interpreted in plain language; SD vs SE distinction clearly articulated with correct formula rationale
Hypothesis Testing and Test Selection (CM6.3): Correct test choice, null hypothesis formulation, and p-value/chi-square interpretation	5 pts	Exceeds: Both null hypotheses correctly stated; test selection for both comparisons correct with full decision-algorithm reasoning; t-test and chi-square results interpreted accurately including clinical implications; Fisher's exact discussion correct
Statistical Software and Critical Interpretation (CM6.5, CM6.6): CI interpretation, test choice for ≥3 groups, and post-hoc analysis understanding	5 pts	Exceeds: CI interpretation correct (null excluded → significant) without restating p-value; multiple t-test inflation problem explained accurately (α-inflation); ANOVA selected as correct test with correct reasoning; post-hoc test identified and its purpose explained clearly