To have somebody do something
means two things:
A) basically, that someone asks or order someone else to do something, even if in informal ways.
B) it means "to get somebody to do something".https://www.gymglish.com/en/english-gra ... -somethingTo have + somebody + do something (infinitive without to) means 'to get somebody to do something'.
Example: Bruno had Icarus check last year's figures. Bruno got Icarus to check last year's figures.
So, back to the crux, we could say that:In the last phase of the experiment, researchers had the students write down as many of the study words as they could, in ten minutes.
Na última fase do experimento, os pesquisadores pediram/mandaram
os estudantes escreverem o máximo de palavras que pudessem, em dez minutos.