A school psychologist wants to test the effectiveness of a new method of teaching Health. She recruits 600 fourth-grade students and randomly divides them into thw groups. Group 1 is taught by means of the new method, while Group 2 ls taught via traditional methods. The same teacher is assigned to teach both groups. Al the end of the year, an achievement test is administered and the results of the two groups compared ts What is the response variable in this experiment?
O A. The score on the achievement test
O B. The students' ability in Health °
C.The score of Group 2 on the achievement test
O D. The score of Group 1 on the achievement test

Please note that the terms "response variable" can be used instead of "dependent variable", and the dependent variable is a variable whose outcome is as a result of the change in the independent variable. It is the variable that the experimenter sets out to study in an experiment.

In this example, the score of the achievement test is a measure that tells of how effective the teaching method was on the selected group, and this is the dependent variable because it completely depends on the teaching method employed.

Please note that the dependent variable is another kind of variable and it is one that is completely under the control of the experimenter. In this case, the teaching method is the dependent variable.