W1—for multiple choice question, +1 for each correct
answer, 2 for each incorrect/missed answer; +2 for
each correct point in free-text answer.
W2—for multiple choice question, +1 for each correct
answer, 1 for each incorrect answer, 0 for missed
answers; +2 for each correct point in free-text
answer.
Normalized W2—since the maximal number of correct
answers for the multiple choice questions is different
for each test video, we thus additionally built
the normalized result of W2.
Fig. 12 shows that learning effectiveness can be improved
measurably by using video indexing tools, where the mean
and standard deviation of scoring results are depicted in
Table 7. Almost all the participants have used the keyframe
and outline feature in this task for reviewing knowledge
points, while the keyword feature was rarely used during
the watching process. The results of the post-test-questionnaire
indicate that all participants would like to see the
indexing tools be used in lecture video archives.