RESULTS
Tests
Test scores were as follows:
Table 2. Test scores
Student Pre-test Post-test Difference
A 6 7 +1
B 9 12 +3
C 7 13 +6
D 7 Absent -
E 2 12 +10
F 13 13 0
G 7 13 +6
H 10 9 -1
I 4 6 +2
J 7 14 +7
K 9 15 +6
L 8 11 +3
M 8 12 +4
N 8 16 +8
Mean 7.5 11.77 +4.27
p-value (2-tailed) 0.003
The maximum mark possible on the pre-test was 21, on the post-test it was 20; on average, the marks improved by approximately 22%. Because there was not a normal distribution of scores, a Wilcoxon signed ranks test was used; this showed that the probability that the increases in scores would occur randomly is three in a thousand. Statistically, these results are significant.