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Which of These Assumptions Means the Errors Are Uncorrelated with All

Question 10

Multiple Choice

Which of these assumptions means the errors are uncorrelated with all x's?

A) E(e_it) = 0
B) var(e_it) = E(e²_it) = $\sigma$ ²
C) cov(e_it,e_js) = E(e_it,e_js) = 0 for i j or t s
D) cov(e_it,x_2it) = 0,cov(e_it,x_3it)

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