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已知某地正常人某定量指标的总体均值μ0=5,今随机测得该地某人群中80人该指标的数值,若资料满足条件使用,检验来推断该人群该指标的总体均值μ与μ0之间是否有差别,则自由度为()

  • A、4
  • B、5
  • C、76
  • D、79
  • E、80

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