In an experiment, the researcher randomly assigns students who have been caught smoking inside the high school to three different classes of a health class in which the teacher will address the issues of adolescent smoking. One advantage of this experimental procedure is
◦ variables, such as the type of adolescent smoker, will be controlled in the study.
◦ any variability in student characteristics will be equated among the classes.
◦ the students who are caught smoking will be required to take a health class.
◦ the students will be randomly assigned to the three classes and equally distributed.