Answer:
Random assignment
Step-by-step explanation:
In psychology, the term Random assignment refers to the use of procedures involving just chance when creating groups for a study so that each participant has the same opportunity to be assigned to any group. In other words, the participants get to be randomly assigned to the groups and therefore creating a more valid experiment and non biased.
Therefore, random assignment is defined as a method used to assign participants to different research conditions to guarantee that all participants have the same chance of being in any specific group.