If Xit is correlated with Xis for different values of s and t, then
A) Xit is said to be autocorrelated
B) the OLS estimator cannot be computed
C) statistical inference cannot proceed in a standard way even if clustered standard errors are used
D) this is not of practical importance since these correlations are typically weak in applications
Answer: A
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a. divorced or separated persons b. African Americans and other minorities c. families headed by a female d. persons between the ages of 35 and 54
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A. efficient; inefficient B. inefficient; efficient C. attainable; unattainable D. rational; zero-cost E. unattainable; efficient