Consider the regression equation Yi = /31 + P2X2i /33X31 ei where X21 is exogenous and X3i is endogenous. •7`i is a valid instrument for X3i In this context, what is meant by the statement that " X3i is endogenous"? You may select more than one condition. You will receive credit for each correct condition. You will lose marks for selecting an incorrect condition. The lowest mark that you can score for this question is zero. Select one or more: Da. cov(ei, zi) 0 ob. E(eilzi) 0pc. geilx3i) =10 ?d. geilx3i) 0 De. COV(Xi, Zi) = 0 of. cov(xi, z) 0¦g. E(x3ilzi) = 0E(eilzi) = 0 a cov(ei, zi) = 0 E(x3i1;) 0
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