jogsmarin6771 jogsmarin6771

25-05-2023
Mathematics

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Consider Y = B0 + B1x + u. Suppose z is an instrument for x. Which must be true?
A) cov(z,u) = 0
B) cov (z,u) > 0
C) cov (z,x) > 0
D) cov (z,x) = 0

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