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.
题目中没有提及omitted variables is important，如果该变量加回导致多重共线性，反而会导致模型估计不准确。并且题目中说omitted variable 说明这个变量已经被剔除了，如果前提假设已经发现模型有多重共线性，通过去除相关变量，模型优化才对。所以觉得题目没有说清楚
