One advantage of the correlated-groups t-test over the independent-groups t-test is that it reduces the error variance due to
A)the degrees of freedom.
B)the independent variable.
C)the dependent variable.
D)individual differences.

Question

Quizplus · Accepted Answer

The correlated-groups t-test uses pairs of participants who are matched on relevant variables (e.g. age, gender, intelligence) which reduces individual differences between groups, leading to lower error variance. Therefore, D is the correct choice as it mentions individual differences. A, B, and C are incorrect as they do not address the advantage of correlated-groups t-test over independent-groups t-test.

One Advantage of the Correlated-Groups T-Test Over the Independent-Groups T-Test