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【多选题】
对于单因素方差分析的组内误差,下面种说法正确的是( )A.
其自由度为r-1
B.
反映的是随机因素的影响
C.
反映的是随机因素和系统因素的影响
D.
组内误差一定小于组间误差
E.
其自由度为n-r
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A.
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B.
let them know about their future career development
C.
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D.
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