Small sample sizes in an experiment
A) biases the estimators of the causal effect.
B) may pose a problem because the assumption that errors are normally distributed is dubious for experimental data.
C) do not raise threats to the validity of confidence intervals as long as heteroskedasticity-robust standard errors are used.
D) may affect confidence intervals but not hypothesis tests.
Answer: B) may pose a problem because the assumption that errors are normally distributed is dubious for experimental data.
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a. True b. False
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