Question

school psychologist a wants to test the effectiveness of a new method for teaching arithmetic using a randomized experiment. she recruits 500 second - grade students in the local school district and randomly divides them into two groups. group 1 is taught by means of the new method, while group 2 is taught by traditional methods. the same teacher is assigned to teach both groups. at the end of the year, an achievement test is administered and the results of the two groups are compared. what is the dependent variable in this randomized experiment?
o score on achievement test
o 500 second - grade students
o year grade assigned by teacher

Explanation:

In an experiment, the dependent variable is what is measured. Here, the goal is to measure students' performance in arithmetic. The achievement test score at the end of the year reflects how well the teaching - method (the independent variable) worked. So, the achievement test score is the dependent variable.

Answer:

Achievement test score