A researcher argues that interleaving — practicing several related skills in a mixed order — improves long-term retention more than blocked practice, in which one skill is practiced repeatedly before moving on.
Which experimental finding, if true, would most strongly support the researcher's argument?
- A
Math curricula vary across schools.
- B
Most students prefer blocked practice when given the choice.
- Ccheck_circle
Students who practiced math problem types in a mixed order outperformed students who practiced the same problems in blocked order on a test given two weeks later, despite both groups completing the same total number of problems.
- D
Interleaved practice can feel more difficult than blocked practice.
Explanation
A controls problem count and shows the predicted long-term retention advantage for interleaving. B and C describe perceptions; D is tangential.