{
  "id": "S116",
  "type": "单选题",
  "type_code": "single",
  "stem": "多元线性回归模型[[IMG:13_image7.png]]中，估计的残差平方和为900，样本容量为50，则随机误差项μ的方差估计量为（）。",
  "stem_text": "多元线性回归模型[y = β₀ + β₁x₁ + β₂x₂ + β₃x₃ + β₄x₄ + μ]中，估计的残差平方和为900，样本容量为50，则随机误差项μ的方差估计量为（）。",
  "options": [
    {
      "key": "A",
      "text": "18"
    },
    {
      "key": "B",
      "text": "19.57"
    },
    {
      "key": "C",
      "text": "20"
    },
    {
      "key": "D",
      "text": "20.93"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "18"
    },
    {
      "key": "B",
      "text": "19.57"
    },
    {
      "key": "C",
      "text": "20"
    },
    {
      "key": "D",
      "text": "20.93"
    }
  ],
  "answer_keys": [
    "C"
  ],
  "answer_display": "C",
  "answer_texts": [
    "20"
  ],
  "sources": [
    {
      "edition": "第13届",
      "edition_num": 13,
      "no": 57,
      "uid": "13-057",
      "file": "第13届市调大赛本科组模拟题.docx"
    }
  ],
  "source_display": "第13届 第57题",
  "source_count": 1,
  "images": [
    "13_image7.png"
  ],
  "warnings": [],
  "conflict": null,
  "url": "/q/S116.html"
}