问一道题：NO.PZ2018101001000016

问题如下：

If given the multiple R-squared is 0.81, which one of the following explanations is least likely correct?

选项：

The model, as a whole, could explain 81% of dependent variable’s change.

The correlation’s square between predicted and actual values of the dependent variable is 0.81.

Some of the independent variables could explain 81% of dependent variable’s change.

解释：

C is correct.

考点: R-squared and adjusted R-squared.

解析: Multiple R-squared代表的是多元回归下的$R^2$，代表的是整个模型作为一个整体对因变量的解释力度，所以A正确，C错误。在多元回归模型下，$R^2$ 等于估计的因变量与因变量之间的相关系数的平方，所以B选项也是正确的。