The final results were from a survey, not a study where they trialed Super Mario games on students and followed their progress.
Also did you notice that the numbers in your quote don’t even agree? In parentheses the numbers are out of 41, not 336.
This is not a serious paper.
I agree that it's at least sloppy.
> The final results were from a survey, not a study where they trialed Super Mario games on students and followed their progress.
afaik a study can consist of one single survey
> This is not a serious paper.
Maybe, maybe not, my only point was about the sample size which was surprising if you read only the top part.
It definitely can (and they had interviews too), although there's a lot of limitations with their methodology they don't address in the paper.