题目内容：
在重复简单随机抽样中，抽样平均误差要减少1/3，则样本单位数就要扩大到A、4倍
B、2倍
C、3倍
D、9倍
参考答案：
选择题：在重复简单随机抽样中，抽样平均误差要减少1/3，则样本单位数就要扩大到A、4倍B、2倍C、3倍D、9
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A、4倍
B、2倍
C、3倍
D、9倍
A、4倍
B、2倍
C、3倍
D、9倍
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