Researchers in Spain interviewed 7725 13-year-olds about their homework habits—how much time they spent per night on homework and whether they got help from their parents or not—and then had them take a test with 24 math questions and 24 science questions. They found that students who spent between 90 and 100 minutes on homework did only a little better on the test than those who spent 60 to 70 minutes on homework. Beyond 100 minutes, students who spent more time did worse than those who spent less time. The researchers concluded that 60 to 70 minutes per night is the optimum time for students to spend on homework. Is it appropriate to conclude that students who reduce their homework time from 120 minutes to 70 minutes will likely improve their performance on tests such as those used in this study? Why or why not?