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1.45
1.6
1.4
1.17
1.2
0.91
1
0.8
0.6
0.4
0.2
0
arts
sciences (other than
computers)
computer-related
sciences
Fig. 4.12 The average times of reading per background category
6.54
7
6
5
4
2.7
3
2
0.75
1
0
arts
sciences (other than
computers)
computer-related
sciences
Fig. 4.13 The average times of returns to concepts for revision per background category
In addition, an experiment was conducted to ensure the validity of the conclu-
sions drawn by the student model concerning the aspects of the students' charac-
teristics. In particular, the mean values of times of reading of a domain concept
of the learning material were measured for group A and group B. Furthermore,
the statistical significance of the difference of the mean values of reading times
between the learners of different backgrounds was checked. ANOVA is the statisti-
cal method that was chosen for the analysis of the experiment's data. The different
mean values of reading times for both groups are presented in Table 4.12 .
In the particular experiment, there is homogeneity of variances (the “Sig.”
value of “Levene's test” is higher than 0.05—Table 4.13 ). Furthermore, the “Sig.”
value (Sig. = 0.000 < 0.0005) of the Table 4.14 declares that there is a signifi-
cant difference on the times of reading between the learners of different back-
grounds. Moreover, the comparisons of Table 4.15 show that for group A the
mean value of reading times is significantly different between the learners with
 
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