{
  "id": "S112",
  "type": "单选题",
  "type_code": "single",
  "stem": "如果y关于x的回归方程为ŷ＝3－2x，[[IMG:13_image5.png]]＝0.81，则x与y之间的相关系数是（ ）。",
  "stem_text": "如果y关于x的回归方程为ŷ＝3－2x，[R²]＝0.81，则x与y之间的相关系数是（ ）。",
  "options": [
    {
      "key": "A",
      "text": "0.9"
    },
    {
      "key": "B",
      "text": "-0.9"
    },
    {
      "key": "C",
      "text": "0.8"
    },
    {
      "key": "D",
      "text": "-0.8"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "0.9"
    },
    {
      "key": "B",
      "text": "-0.9"
    },
    {
      "key": "C",
      "text": "0.8"
    },
    {
      "key": "D",
      "text": "-0.8"
    }
  ],
  "answer_keys": [
    "B"
  ],
  "answer_display": "B",
  "answer_texts": [
    "-0.9"
  ],
  "sources": [
    {
      "edition": "第13届",
      "edition_num": 13,
      "no": 53,
      "uid": "13-053",
      "file": "第13届市调大赛本科组模拟题.docx"
    },
    {
      "edition": "第17届",
      "edition_num": 17,
      "no": 53,
      "uid": "17-053",
      "file": "17届市调大赛本科组模拟题.docx"
    }
  ],
  "source_display": "第13届 第53题、第17届 第53题",
  "source_count": 2,
  "images": [
    "13_image5.png",
    "17_image2.png"
  ],
  "warnings": [],
  "conflict": null,
  "url": "/q/S112.html"
}