{
  "id": "S219",
  "type": "单选题",
  "type_code": "single",
  "stem": "若列联表的行数为5，列数为6，则[[IMG:15_image4.png]]统计量的自由度为（ ）。",
  "stem_text": "若列联表的行数为5，列数为6，则[χ²]统计量的自由度为（ ）。",
  "options": [
    {
      "key": "A",
      "text": "5"
    },
    {
      "key": "B",
      "text": "11"
    },
    {
      "key": "C",
      "text": "30"
    },
    {
      "key": "D",
      "text": "20"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "5"
    },
    {
      "key": "B",
      "text": "11"
    },
    {
      "key": "C",
      "text": "30"
    },
    {
      "key": "D",
      "text": "20"
    }
  ],
  "answer_keys": [
    "D"
  ],
  "answer_display": "D",
  "answer_texts": [
    "20"
  ],
  "sources": [
    {
      "edition": "第15届",
      "edition_num": 15,
      "no": 51,
      "uid": "15-051",
      "file": "第15届市调大赛本科组模拟题1.docx"
    }
  ],
  "source_display": "第15届 第51题",
  "source_count": 1,
  "images": [
    "15_image4.png"
  ],
  "warnings": [],
  "conflict": null,
  "url": "/q/S219.html"
}