Which type of error is used to compute the confidence interval for two related samples selected from at least one population with an unknown variance?
A) standard error
B) estimated standard error
C) estimated standard error for the difference
D) estimated standard error for the difference scores

Question

Quizplus · Accepted Answer

The correct answer is D) estimated standard error for the difference scores. This is because when computing the confidence interval for two related samples (e.g., matched pairs or repeated measures), the variability of the difference scores between pairs is what matters, not the variability within each sample. Since the population variance is unknown, an estimate based on the sample data is used, hence "estimated standard error for the difference scores."

Which Type of Error Is Used to Compute the Confidence