When samples are dependent, the standard error of the difference between two means will be
A) larger than when samples are independent
B) smaller than when samples are independent
C) smaller or larger than otherwise, but we cannot predict which
D) unaffected

Question

Quizplus · Accepted Answer

When samples are dependent, the standard error of the difference between two means is typically smaller because the variability due to individual differences is reduced, as the same subjects are used in both conditions.

When Samples Are Dependent, the Standard Error of the Difference