The article "Puzzles in Statistical Reasoning" explores how students' effort in studying affects their statistical reasoning abilities. The researchers found that students who put in more effort tend to have lower correct reasoning scores but higher misconception scores. This suggests that how much effort students put into learning can impact their understanding of statistics. The study also addressed puzzles related to gender differences and course performances, as well as a country-effect. The findings highlight the importance of considering students' learning approaches in statistics education.