Statistical evaluation using Fisher’s Exact Test. To see if there were biases influencing the results of the survey several groups of respondents were created and compared to each other.
All questions used the same Likert scale, which made the scale a defensible approximation to an interval scale.
After consulting the statistical support service of the Institute of Biometrics of the University of Veterinary Medicine Hannover, the non-parametric Fisher’s Exact Test was used with statistic software SAS (Scandinavian Airlines System) Version 9.2 under the assumption of unequal variances, two-tailed distributions and a significance level of 0.05.
The free text answers were also summarized and qualitatively presented, the three most
important objectives would be presented. An overall view of all learning objectives with
mean values and level distribution was attached as Additional file 1.