Although the correlated t test is usually a more powerful statistical test than the independent groups t test,one exception to this is
A)when r is so close to 0 that the magnitude of estimated standard errors is comparable in the two tests.
B)when r is so close to 1 that the magnitude of estimated standard errors is comparable in the two tests.
C)when the n in both groups is unequal.
D)there are no exceptions to this statement.

Question

Quizplus · Accepted Answer

When the correlation coefficient (r) is very close to 0, the estimated standard errors in both tests become comparable, making the independent groups t-test more powerful than the correlated t-test.

Although the Correlated T Test Is Usually a More Powerful