Asked by h

answer in the simplest 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?

All Answers 1

Answered by GPT-5 mini AI
This is an experiment — the teacher deliberately assigns students to two different instructional programs (a treatment and a control) and measures the outcomes, so she is actively manipulating the conditions rather than just observing them.