Question

34)

When results from a study or experiment are consistent over many settings and iterations they are reproducible they are externally valid A. B. they are biased C. A and B but not C D.

Answer 1

Question 1:

Option (A) is correct because when the results are reliable, they reproduce the same or consistent results over time, different settings and iterations. If a study or experiment is reliable, it is not necessary it would be valid too.

Question 2:

Option (B) is correct. The confidence interval becomes robust while narrowing down in the random control trial or a fixed effect model because it uses the large sample sizes which makes the standard error approaching zero, results in making the confidence interval robust.

Question 3:

Option (C) is correct. An instrumental variable is used when one is concerned with endogeneity, that is, the presence of endogenous variables that are influenced by the other variables in the model. This results in unexpected behaviour between the variables.