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【单选题】
通过随机抽样分析两种对象头发中某种金属元素含量高低，若不符合t检验的条件，并无法通过数据转换改善正态性或方差，则采用（）。A.
F检验
B.
配对t检验
C.
X 2 检验
D.
秩和检验
E.
单侧检验
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A.
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B.
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C.
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