Question: In preparing for a test on a set of material, is it better to study one topic at a time or to study topics mixed

In preparing for a test on a set of material, is it better to study one topic at a time or to study topics mixed together? In one study,¹a sample of fourth graders were taught four equations. Half of the children learned by studying repeated examples of one equation at a time, while the other half studied mixed problem sets that included examples of all four types of calculations grouped together. A day later, all the students were given a test on the material. The students in the mixed practice group had an average grade of, while the students in the one-at-a-time group had an average grade of. What is the best estimate for the difference in the average grade between fourth-grade students who study mixed problems and those who study each equation independently?

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