:a school psychologist wants to test the effectiveness of a new computer method for teaching reading to first graders. she recruits 400 first grade students in her school district and randomly divides them into two groups. group 1 is taught by means of the new computer method, while group 2 is taught via the traditional method. 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 response variable in this experiment? 0 a. the students' ability in mathematics b. the score on the achievement test o c. the score of group 1 on the achievement test d. the score of group 2 on the achievement test