Just college lab courses, but come on, it’s pretty basic. The experiment merely tests a single variable by changing it while keeping everything else the same. There could have been dozens of different samples that men sniffed and it wouldn’t really make the data complicated.
It would increase the length of the test, though, so dozens of samples would have been cumbersome. But just two? Literally just “see how the test group responds to sample 1, sample 2, and the control sample”? That’s not complicated science. You probably did that in highschool lol