Although the Correlated T Test Is Usually a More Powerful

Multiple Choice

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.