{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/check-who-could-enter-the-sample",
  "id": "MHC-D-RESEARCH-0259",
  "version": "0.1.0",
  "title": "Check who could enter the sample",
  "summary": "A million answers from the wrong doorway still came through that doorway.",
  "kind": "question",
  "body": "Inspect the route into the sample before admiring its size. Ask which part of the intended population was reachable, eligible and likely to participate. More records can reduce random noise while leaving systematic omissions intact.",
  "limits": [
    "A probability sample also needs correct implementation, response handling and analysis."
  ],
  "topics": [
    "union-statistical-judgment"
  ],
  "intents": [],
  "source_ids": [
    "RS-067D61EDD2C98F88"
  ],
  "evidence": [
    {
      "claim": "Increasing sample size does not by itself correct a sampling process that systematically misses part of the target population.",
      "source_id": "RS-067D61EDD2C98F88",
      "role": "supports",
      "note": "The appropriate sampling design depends on the population and the question.",
      "locator": "Unrepresentative and convenience samples; nonsampling errors"
    }
  ],
  "use_when": [
    "A large survey or dataset is presented as representative because it contains many records."
  ],
  "avoid_when": [
    "A probability sample also needs correct implementation, response handling and analysis."
  ],
  "example": "Feedback collected only inside a desktop application misses people who could not install or open it.",
  "check": "The population claim is justified by the recruitment process, not just the row count.",
  "question": "Who had a chance to be included? · Which relevant groups were absent from the sampling route? · Does the conclusion stay within the population the design can reasonably describe?",
  "sources": [
    {
      "id": "RS-067D61EDD2C98F88",
      "title": "Introductory Statistics 2e, 1.2: Data, Sampling, and Variation",
      "url": "https://openstax.org/books/introductory-statistics-2e/pages/1-2-data-sampling-and-variation-in-data-and-sampling"
    }
  ],
  "relations": [
    {
      "from": "MHC-D-RESEARCH-0259",
      "to": "MHC-D-RESEARCH-0260",
      "type": "useful_with",
      "url": "/knowledge/treat-missing-responses-as-an-unanswered-question"
    },
    {
      "from": "MHC-D-RESEARCH-0259",
      "to": "MHC-D-RESEARCH-0261",
      "type": "compare_with",
      "url": "/knowledge/ask-what-was-randomized"
    }
  ],
  "collections": [
    {
      "id": "RC-D4FD0B28897E9517",
      "title": "Check what a study can actually tell you",
      "url": "/collections/check-what-a-study-can-actually-tell-you"
    }
  ]
}