This preprint reports a framework-agnostic statistical analysis of published measurements of Newton's gravitational constant G. Across an audited corpus of Big G measurements, experiments documenting gas-pressure systematic checks exhibit substantially smaller absolute residuals relative to CODATA than experiments without such documentation. The analysis reports Welch, Mann-Whitney, and exact permutation tests, plus leave-one-out robustness checks. The result supports a systematics-dominated reading of part of the Big G discrepancy and motivates prospective tracking of the Birge ratio as new measurements are published. This release does not propose a new value of G, does not claim a new theory of gravity, and excludes proprietary engineering implementations, patent-directed apparatus designs, and unpublished calibration protocols. Disclosure: AI tools were used for drafting assistance, code generation, formatting, and internal consistency checks. The author is solely responsible for the study design, analysis choices, verification, conclusions, and final manuscript.
Luqman Mahmood (Tue,) studied this question.