{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/separate-repeatable-measurements-from-correct-measurements",
  "id": "MHC-D-RESEARCH-0254",
  "version": "0.1.0",
  "title": "Separate repeatable measurements from correct measurements",
  "summary": "A clock can be reliably five minutes wrong.",
  "kind": "concept",
  "body": "Precision describes agreement among repeated measurements; accuracy concerns closeness to the relevant reference. Repeating the same biased measurement reduces neither the bias nor the need for a suitable check. Ask which property the evidence actually demonstrates.",
  "limits": [
    "The reference itself has uncertainty, and a check at one value does not validate every operating condition."
  ],
  "topics": [
    "union-numerical-reasoning"
  ],
  "intents": [],
  "source_ids": [
    "RS-5198362E64A50C0D"
  ],
  "evidence": [
    {
      "claim": "Precision concerns agreement among repeated measurements; accuracy concerns agreement with the relevant reference value.",
      "source_id": "RS-5198362E64A50C0D",
      "role": "supports",
      "note": "Real measurement assessment also requires suitable references and uncertainty, not merely two labels.",
      "locator": "Accuracy and Precision"
    }
  ],
  "use_when": [
    "A device or process gives very consistent readings and you are tempted to call it accurate."
  ],
  "avoid_when": [
    "The reference itself has uncertainty, and a check at one value does not validate every operating condition."
  ],
  "example": "A scale that consistently reads a known reference mass too high is precise in those readings but not accurate for that reference.",
  "check": "Repeatability and reference agreement are reported separately.",
  "sources": [
    {
      "id": "RS-5198362E64A50C0D",
      "title": "Chemistry 2e, 1.5: Measurement Uncertainty, Accuracy, and Precision",
      "url": "https://openstax.org/books/chemistry-2e/pages/1-5-measurement-uncertainty-accuracy-and-precision"
    }
  ],
  "relations": [],
  "collections": [
    {
      "id": "RC-D976097B2A42D9AC",
      "title": "Make the numbers answer the right question",
      "url": "/collections/make-the-numbers-answer-the-right-question"
    }
  ]
}