The components of internal validity are a. a large sample, and BLUE property of the estimator.
b. a regression $R ^ { 2 }$ 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.

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The Answer of The components of internal validity are a. a large sample, and BLUE property of the estimator.
b. a regression $R ^ { 2 }$ 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.

The Components of Internal Validity Are A R2R ^ { 2 }R2

The Components of Internal Validity Are A $R ^ { 2 }$