试题与答案

Y关于X的回归平方和为 A.20 B.30 C.40 D.45 E.0.7071

题型:单项选择题

题目:

Y关于X的回归平方和为

A.20
B.30
C.40
D.45
E.0.7071
根据11对(X,Y)的样本数据计算获得自变量X的方差为4.5,反应变量Y的方差为4.0,X与Y的相关系数平方值为0.5。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:对

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Last summer I was a volunteer at a shelter (避难所)for the homeless, a place for homeless people to sleep at night. I wasn’t working that summer and was  36  only two classes in summer school, so I had some  37 time.
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