Question

answer in the simpilest way

(a)
Ms. Harris, a math teacher, wants to compare the effectiveness of a new math instructional program.
She tests each student’s math ability and then divides the students into two groups.

One group uses the new instructional program, while the other group uses the standard curriculum.
At the end of the year, the teacher retests all the students and compares the increase in math ability in the two groups.

​Part A:
Is this an observational study or an experiment? Why?

Answer 1

Experiment — the teacher actively assigns students to different instructional programs (manipulates the treatment) and then measures the outcomes.