A Study Based on OLS Regressions Is Internally Valid If

question 29

Multiple Choice

A study based on OLS regressions is internally valid if

• A)the errors are homoskedastic, and there are no more than two binary variables present among the regressors.
• B)you use a two-sided alternative hypothesis, and standard errors are calculated using the heteroskedasticity-robust formula.
• C)weighted least squares produces similar results, and the t-statistic is normally distributed in large samples.
• D)the OLS estimator is unbiased and consistent, and the standard errors are computed in a way that makes confidence intervals have the desired confidence level.

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Definitions:

Acquired Reflexes

Learned reflex actions that develop as a result of repeated exposure to a stimulus, differing from innate reflexes present at birth.

Biological Clock

An internal mechanism in organisms that controls the timing of various biological functions, such as sleep-wake cycles and hormonal changes.

Daily Rhythms

Natural patterns of activity that follow a roughly 24-hour cycle in living organisms, often referred to as circadian rhythms.

Hypothalamus

A region of the brain that coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems.