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9.有两个独立随机的样本，样本含量分别为n1和n2，在进行成组设计资料的t检验时，自由度是（）
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9.有两个独立随机的样本，样本含量分别为n1和n2，在进行成组设计资料的t检验时，自由度是（）
A、n1+n2
B、n1+n2-1
C、n1+n2+1
D、n1+n2-2
时间：2021-09-01 19:07
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青书学堂
河南城建学院
安全工程
高等数学
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D
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