Consider a regression of y on x1, x2 and x3. You are told that x1 and x3 are positively
correlated but x2 is uncorrelated with the other two variables.
(a)  What, if anything, can you say about the relative magnitudes of the estimated
coefficients on each of the three explanatory variables?
(b)  What, if anything, can you say about the precision with which we can estimate
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