A group of students is divided into two groups. One group listens to classical music while taking a math test and the other group takes the test in silence. The average test scores of the two groups are compared to see whether listening to music during a math test has an effect on scores.
A)Controlled experiment
B)Observational study

Question

Quizplus · Accepted Answer

This is a controlled experiment because the researchers are manipulating the conditions (listening to music or silence) to observe the effect on test scores.

A Group of Students Is Divided into Two Groups