【单选题】【消耗次数：1】
表示均数的抽样误差大小的统计指标是（ ）
①
标准差
②
方差
③
均数标准误
④
变异系数
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相关题目
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均数和标准差的关系是:（）。
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均数愈大,S愈小
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均数愈大,S愈大
③
S愈大,均数对各变量值的代表性愈好
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S愈小,均数对各变量值的代表性愈好
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标准误越大，样本均数代表性越大
④
标准误越大，样本均数推断总体均数的可靠性越大
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