simple past tense and past participle of randomize
"The researcher randomized all participants into two separate groups before beginning the experiment."
In plain English: To randomize something means to mix it up so that every part has an equal chance of being picked first.
"The software randomized all the answers so no two students would see them in the same order."
set up or distributed in a deliberately random way
"The researcher randomized the participants into two groups to ensure that neither selection nor external factors influenced the results."
Obtained by randomization
"The study participants were randomized into two groups, so their assignment was completely arbitrary and not based on any selection criteria."