问题如下：
What is if ?
选项：
A.0
B.1
C.-1
D.undecided
解释：
The only time is when Cov(X,Y) = 0 and so the two variables are uncorrelated. The is the squared correlation and so must be 0.
是不是只有在线性的条件下才能这样说啊
NO.PZ2020010801000006 问题如下 Whis R2R^2R2 if β^=0\wihat\beta = 0β=0? A.0 B.1 C.-1 unci The only time β^=0\wihat\beta = 0β=0 is when Cov(X,Y) = 0 anso the two variables are uncorrelate The R2R^2R2 is the squarecorrelation anso must 0. beta cap不是估计的beta值吗？为什么可以这么肯定的说correlation等于0呀
求教是不是只有在线性的条件下才能这样说啊
老师，β cap是什么呢？
