Question

One researcher conducted a study using two classes in one school. First, the researcher gave a math test to every student in the two classes. The researcher then asked a teacher in one class to use some new methods when teaching math. The teacher in the second class did not use the new methods. At the end of the semester, the researcher again gave the math test to every student in the two classes. What experimental design did this researcher use? How do you know?

Answer 1

Independent measures experimental design is used in this case.

We know this from the fact that the two groups of comparison are both different as one is the first class where the teacher used new methods for teaching maths and the other is a second class where the teacher did not use the new methods. Both groups have different students.

The objective is to measure whether there is a significant difference in test scores of the two classes of students due to the new teaching method.