Suppose that you are interested in estimating the average impact a job training program has on wages. However, you recognize that there are some observed factors that influence wage, participation on the training program, or both. You may still get the unbiased estimate for the program effectiveness by:

	a.	Including only the factors that predict participation but not wage as controls and running a multiple linear regression
	b.	Excluding those observed factors from your model and running a simple linear regression
	c.	Including only the factors that predict wage but not participation as controls and running a multiple linear regression
	d.	Including factors that predict both wage and participation as controls and running a multiple linear regression

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Control variables in the multiple regression are used to remove their effects from the equati... View the full answer