问题如下：
If an omitted variable is correlated with variables already included in the model, coefficient estimates will be biased and inconsistent and standard errors will also be inconsistent.Is this Statement correct?
选项：
A.Yes
No, because the model’s coefficient estimates will be
unbiased.
No, because the model’s coefficient estimates will be consistent.
解释：
The statement is correct because a correlated omitted
variable will result in biased and inconsistent parameter estimates and inconsistent
standard errors.
题意不就是残差项与其中一个X相关，那不就是条件异方差现象吗？
