{
  "capability_id": "engineering.uncertainty.precision_mean",
  "calculation_version": "1.0.1",
  "protocol_version": "1.0.0-proposed",
  "protocol_document_status": "proposed",
  "verification_revision": "2026-09-23.o2-o3",
  "claim_scope": "O2: ISO 21748 u = √(s_L² + s_r²/n) vs a separate-module identity (≤2 ULP). Not R = 2.8·s_R, not Type A from a sample, and not U = k·u. ≤2 ULP vs O3 applies only to the published tabulated ISO 21748 vectors (both components, repeatability only, laboratory only, an alias, and one awkward mean). It is not a whole-domain guarantee and does not cover R = 2.8·s_R, Type A from a sample, or U = k·u.",
  "oracle": {
    "class": "O3",
    "library": "mpmath 1.4.1",
    "mpmath_dps": 80,
    "backend": null,
    "rounding": null,
    "independent_of_iut": true,
    "generator_id": "precision-mean-mpmath-o3",
    "generator_version": "1.0.0",
    "generator_sha256": "da63953998aa6f03cd29955a837db35d5e3cde5f1864871664054195fb44f665",
    "table_sha256": "1c804c5bf18d3f97f32e74438f6e023886de27b20a18860a1cfa228208d52ad0"
  },
  "result_summary": {
    "passed": 8,
    "total": 8,
    "failed": 0,
    "max_error_ulp": 1,
    "threshold_ulp": 2,
    "max_threshold_ulp": 2
  },
  "public_files": {
    "manifest": "/evidence/engineering.uncertainty.precision_mean/1.0.1.cvp.json",
    "this_file": "/evidence/engineering.uncertainty.precision_mean/reproduce.json"
  },
  "vectors": [],
  "disclosure": {
    "policy": "calculatorx-public-evidence-v1",
    "full_validation": "private",
    "representation": "summary",
    "kind": "reproduce"
  }
}