A teacher wants his students to learn how to solve a variety of statistics problems. He teaches them using worked examples, and encourages them to memorize formulas and algorithms using flashcards. On weekly homework assignments, the students can effectively apply techniques learned that week to assigned problems. However, on the final exam, he finds that many students mix up the techniques and use approaches that are inappropriate for the task. They do not struggle to remember the techniques, but they use them at the wrong times. Suggest a change the teacher can make to address this problem, and explain why that change will help.