First, I did not find any statistical test in the paper. The sample size is not relevant.
Further the power of a test already required you to know two parameters: variance and the size of the effect your testing for (difference between means). Proctorio is very careful in not claiming any effectiveness for detecting cheaters, how will you estimate these parameters?
Also iirc, the rule of thumb was for a normal distribution 30 samples is enough for decent strength, 40 samples is enough for general distributions unless you're looking at very small effects, weird distributions or in very noisy experiments.
Further the power of a test already required you to know two parameters: variance and the size of the effect your testing for (difference between means). Proctorio is very careful in not claiming any effectiveness for detecting cheaters, how will you estimate these parameters?
Also iirc, the rule of thumb was for a normal distribution 30 samples is enough for decent strength, 40 samples is enough for general distributions unless you're looking at very small effects, weird distributions or in very noisy experiments.