Finally, we looked at percentiles to get a sense for how the students in the experimental and
control classes performed with respect to the entire class (N=236). We found that more students
in the experimental class than expected were in the top 30% of the class (five instead of four).
More strikingly, we found far fewer students than expected in the bottom 30% of the class (zero
instead of four). In contrast, we found fewer students in the control class than expected in the
top 30% (zero instead of three), and one more than expected in the bottom 30% (five instead of
1 To four). This result, in combination with the overall significant difference in performance between
the experimental and control classes, suggests that the greatest influence of the Tablet PC and
CLP (and Classroom Presenter, by extension) may be in improving performance among students
who might otherwise perform poorly.