The correct option is (D). The purpose of randomization or random assignment is to control confounding variables by equalizing the experimental conditions.
Randomization or random assignment:
A randomization method, such as a chance procedure or a random number generator, is used to randomly assign human or animal subjects to different groups in an experiment. This method is also known as random assignment or random placement.
Imagine a study seeking to determine whether consuming caffeinated beverages before an exam can enhance test performance. Each participant is randomly allocated to either the control group or the experimental group after a pool of participants is drawn at random assignment.
By assigning participants at random, it is possible to prevent systematic differences between and within groups from existing at the commencement of the experiment. As a result, it is safer to attribute any differences between groups that are noted at the end of the trial to the methods or treatments used.
Learn more about random assignment here:
https://brainly.com/question/9423006
#SPJ1
