Suppose the variable 
has been omitted from the following regression equation, 
is the estimator obtained when ![]()
src="@@PLUGINFILE@@/ppg__cognero__Ch_03_Multiple_Regression_Analysis_Estimation__media__70014c5f-f839-4657-b538-a779591b542f.PNG" style="vertical-align:-9px;" height="25px" width="17px" /> is omitted from the equation. If 
is said to _____.
A. have an upward bias
B. have a downward bias
C. be unbiased
D. be biased toward zero
Answer: A
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