Sandwich feedback: The empirical evidence of its effectiveness

This is a dataset from between-subject experiment that tested the effectiveness of “sandwich feedback. 91 university students solved 12 mathematical problems from the secondary-school curriculum. After the time limit, we assigned them randomly to one of three possible treatments. One group received negative computer-administrated feedback, describing the mistakes with their methods and solutions. The second group received sandwich feedback, which contained the same constructive critique, though sandwiched between two general, positive statements that were not related to the real respondents’ effort or performance. The third group did not receive any feedback. Afterwards, the respondents had 10 minutes to prepare for the second set of similar problems.本数据集源自一项被试间实验，旨在检验三明治反馈法（sandwich feedback）的应用效果。91名大学生完成了12道隶属于中学数学课程范畴的数学试题。计时截止后，所有被试被随机分配至三种实验处理组之一：第一组接收计算机给出的负面反馈，该反馈会说明其解题方法与最终答案中存在的错误；第二组接收三明治反馈，该反馈包含与第一组完全一致的建设性批评，但将该批评夹在两条与被试实际付出的努力或表现无关的通用正面评价之间；第三组未获得任何反馈。实验后续环节中，被试有10分钟时间准备第二组同类题型。