On both the pretest and the posttest, the minimum score was 12 and the maximum score was 12 and the maximum score was 24, bu the mean increased from 17.0 to 18.9 and the median increased from 16.0 to 19.5. In the control group, the minimum score was 14 and the maximum was 24 with a mean of 18.3 and a median of 19.0. the box-and-whisker plot [see figure 1] illustrates the differences, indication the lowest performance by the pretest group and the highest by the posttest group, with the control group in between