Question: Please explain. 6. (1.5 pts) Consider the population model y1 = 2101 + only2 + ul, E[z'ul] = 0 (2) y2 = 2712 + v2,
Please explain.

6. (1.5 pts) Consider the population model y1 = 2101 + only2 + ul, E[z'ul] = 0 (2) y2 = 2712 + v2, E[z'v2] = 0. E(u1v2) # 0 implies that (a) y1 is endogenous. (b) y1 is exogenous. (c) y2 is endogenous. (d) y2 is exogenous. (e) Both y1 and yz are endogenous
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