Their sample size was 494 students from classes over seven years (they could have included 3800 but wanted to limit it to a shared choice of language). And not

Their sample size was 494 students from classes over seven years (they could have included 3800 but wanted to limit it to a shared choice of language). And not for nothing, their students were not your typical newbie grad students - they had an average of 3.7 years of industry experience.