These patterns are consistent with the findings of a 1997 study by Dominic Brewer and Dan Goldhaber, which found that more in-class problem solving for American 10th-grade students in math is related to lower test scores on a standardized test. Because our results are based on comparisons of the same student in two different classes, however, they are less subject to the concern that teachers adjust their practices based on the students to which they are assigned. Furthermore, the other commonly investigated teacher characteristics (e.g., gender, experience, and credentials) do not show significant effects on student achievement in our analysis. This is in line with previous findings in the literature and underscores the importance of the statistical relationship between more lecture-style teaching and student achievement.