Which of the following would be the best limitation for the Roediger & Karpicke study that compared practice testing to restudying in the
They tested college students, so the sample is more educated than the general public. Had they tested non-college students (or people in the
"By chance, the group that was assigned to the "practice testing" condition may have known more about the topic described in the passage."
In real classes students may study material more than 1 week before the final test. If there was an even longer delay between the practice
testing/restudy activity and the final test then we might observe an even greater benefit of practice testing.
All of the above are good limitations.
