what is the unconditional variance of sql x what is the unconditional variance of $u2$ in the homoskedasticity assumption? why is $sigma2$ also the unconditional variance of $u2$ in the homoskedasticity assumption? why is $sigma2$ also used as an unconditional variance what is e(sigma)$ and why is it used for the assumption? why is $igma2$ also the unconditional variance of $u? what does this assumption of linear regression include? what is the unconditional variance in linear regression why is $sigma2$ also the unconditional variance of $u2$? what is the conditionality assumption of $u2$ why is $sigma2$ also the unconditional variance why is $sigma2$ also the _unconditional_ variance of $u2$ what is a sigma which assumption is the same as the unconditional variance of sigma? what is sigma and unconditional variance what is the unconditional variance in a linear regression? why is $sigma2$ also the unconditional variance of which statement is the statement that describes unconditional variance? which statement is correct for a linear regression assumption that assumes that the variable sigma is an unconditional variance? what is the unconditional variance of the linear regression?