{
  "id": "S208",
  "type": "单选题",
  "type_code": "single",
  "stem": "对于二元变量，为确保达到调查要求的精度，在计算样本量时，建议对该指标的总体变异程度的取值设定为（）。",
  "stem_text": "对于二元变量，为确保达到调查要求的精度，在计算样本量时，建议对该指标的总体变异程度的取值设定为（）。",
  "options": [
    {
      "key": "A",
      "text": "0"
    },
    {
      "key": "B",
      "text": "0.5"
    },
    {
      "key": "C",
      "text": "0.25"
    },
    {
      "key": "D",
      "text": "1"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "0"
    },
    {
      "key": "B",
      "text": "0.5"
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    {
      "key": "C",
      "text": "0.25"
    },
    {
      "key": "D",
      "text": "1"
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  ],
  "answer_keys": [
    "C"
  ],
  "answer_display": "C",
  "answer_texts": [
    "0.25"
  ],
  "sources": [
    {
      "edition": "第15届",
      "edition_num": 15,
      "no": 38,
      "uid": "15-038",
      "file": "第15届市调大赛本科组模拟题1.docx"
    }
  ],
  "source_display": "第15届 第38题",
  "source_count": 1,
  "images": [],
  "warnings": [],
  "conflict": null,
  "url": "/q/S208.html"
}