题目内容
某内部审计师运用每单位均值抽样计划来估计维修复印机的平均成本。样本量是50台，总体规模是2000台。样本的平均值是75美元，标准离差是14美元，平均数的标准离差是2美元，在置信水平为95%（Z=2）时，置信区间是多少（）
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