The components of internal validity are
A) a large sample, and BLUE property of the estimator.
B) a regression R2 above 0.75 and serially uncorrelated errors.
C) unbiasedness and consistency of the estimator, and desired significance level of hypothesis testing.
D) nonstochastic explanatory variables, and prediction intervals close to the sample mean.
Answer: C) unbiasedness and consistency of the estimator, and desired significance level of hypothesis testing.
Economics
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