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?​
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(b)

​Part B:
How could randomization be used to select the two groups?
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Answer 1

Part A:
This is an experiment — the teacher assigns students to either the new program or the standard curriculum.

Part B:
Randomize by giving each student a number and using a random method (coin flip, random number generator, or draw names) to put half into the new-program group and half into the standard group.