Mix It Up for Better Learning 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 ? I n one study - a 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 77 , while the students in the one at -a - time group had an average grade of 39 . What is the best estimate for the diff reICE IN the average grade between fourth-grade students who study mixed problems and those who study each equation independently ? Give notation ( as a difference with a minus sign for the quantity we are trying to estimate , notation for the quantity that gives the best estimate , and the value of the best estimate , Be sure to clearly define any parameters in the context of this situation