This is just the basic random sampling. 120 students were chosen at random from all classes and every student had the same chances of getting chosen. Things like social background or race were not taken as a criteria for getting chosen, nor did things like gender. Everyone was chosen at random.
Human subjects in clinical trials, hope this helps :)
(an 18 year old died in a gene experiment, pennsylvania)
Please add the question options , thank you...
This is wierd bc i think you can rember things when ur on cocaine im not sure tho