*The presence of omitted variables calls into question the use of a simple linear regression model* y=β_0+β_1 x+u *unless one uses homogenous subsamples as a means of controlling for other variables. So, in a wage equation where the focus is on the impact of education, the sample could be restricted say to females with the same occupation and level of experience.** *

Is this true, false or not certain? Why?

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