2.1.4. Analysis
In order to test whether mean values of situational interest
differ between the two groups, a 2 2 mixed ANCOVA was conducted,
with situational interest measurement 1 as the covariate, a
between-group factor (treatment/control), and situational interest
measurements 2 and 3 as within-group factor. For the analysis the
F- and p-values as well as the effect size (h2) were generated. A
follow-up t-test was conducted to evaluate pairwise differences
between the treatment and control groups for situational interest
measure 3 (i.e., measured after presentation of the problem).