{
  "title": "Refinery data for AI stream and sampling-period review",
  "source_page": "https://fiund.com/industries/refinery-stream-sample-period-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "A sample belongs to its collection window",
    "context": "An inert table exercise represents fictional refinery streams with plain identifiers, no chemistry or operating instructions.",
    "records": [
      [
        "1",
        "Transfer log",
        "Tank T receives stream A until 11:00 and stream B from 11:00."
      ],
      [
        "2",
        "Sample ticket",
        "Jar Q taken at the inlet at 10:55, logged at 11:20."
      ],
      [
        "3",
        "Lab index",
        "Report Q1 references jar Q; timestamp 14:10 is report publication."
      ]
    ],
    "question": "Which stream label belongs on Q1?",
    "answer": "Use stream A: record 2 places collection at 10:55 at the inlet, before the transfer boundary in record 1. Neither the 11:20 registration nor report publication at 14:10 changes the sampled stream. The exercise does not identify the tank contents after transfer.",
    "failureModes": [
      "Choosing stream using report timestamp",
      "Generalizing an inlet sample to all tank contents"
    ],
    "fields": [
      [
        "collection_time",
        "Selects source interval"
      ],
      [
        "collection_location",
        "Distinguishes inlet from tank sample"
      ],
      [
        "record_publication_time",
        "Keeps administrative timestamps separate"
      ]
    ],
    "holdout": "Replace the instant grab with a composite collected from 10:50–11:10; record mixed intervals rather than a single stream.",
    "boundary": "No production stream compositions, process conditions, site identifiers or hazardous operating advice."
  }
}