【单选题】【消耗次数：1】
抽样误差是指：
①
不同样本指标之间的差别
②
样本指标与总体指标之间由于抽样产生的差别（参数与统计量之间由于抽样而产生的差别）
③
由于抽样产生的观测值之间的差别
④
样本中每个个体之间的差别
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