Common approaches:
- Statistical Analysis - for numeric evidence as support
- Interpretation of interview transcripts - using texts (e.g. interpretation of interview transcripts).
- Mean - for continuous data (e.g. score in the competition). The initial tests are carried out to compare different groups of participants, to see where there is a significant differences (in terms of score) between them or not before the competition.
- Chi square test - to see whether specific samples drawn from a population can represent the whole population or not.
- SPSS is just a software to speed up calculation.
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