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协方差和相关系数问题,如图,公式我知道,但这道题的cov和DX怎么求?求这道题的具体过程。
协方差和相关系数问题,如图,公式我知道,但这道题的cov和DX怎么求?求这道题的具体过程。
2025-04-05 23:31:08
推荐回答(1个)
回答1:
一般来说,若Y=aX+b,则当a>0时X与Y的相关系数是1,当a<0时X与Y的相关系数是1。
本题X+Y=n,即Y=-X+n,所以相关系数是-1,答案是(C)。
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