Consider the following simple regression model y=β0 + β1x1 + u.Suppose z is an instrument for x.if Cov(z,u) = 0 and Cov(z,x) ≠ 0,the value of β1in terms of population covariances is _____.
A)
B)
C) Cov(z,u)
D) Cov(z,x)
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