Interaction metric: In the experimental class, we used the number of answers wirelessly
submitted by each student for each problem as a quantitative measure of interaction in the class.
We compared the number of answers expected with the number actually submitted and
computed an average daily submission fraction for each student. Our goal was to see if this
measure of interaction would correlate with performance scores. No such metric was easily
computed in the control class, so our analysis was limited to the experimental class.