Question

school psychology a school psychologist 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. which treatment is the control group?
o the group not being taught arithmetic at all is the control group.
o the group being taught using a traditional method is the control group.
o the group being taught using the new method is the control group.

Explanation:

In an experiment to test the effectiveness of a new teaching method, the control group is the one that receives the standard or traditional treatment. Here, Group 2 is taught by traditional methods, so it serves as the control group against which the group taught by the new method (Group 1) is compared.

Answer:

The group being taught using a traditional method is the control group.